25 20 5

25 (twenty-five) is the natural number following 24 and preceding 26. "Twenty" redirects here For the village in England, see Twenty Lincolnshire. This article discusses the number five. For the year 5 AD see 5. In Mathematics, a natural number (also called counting number) can mean either an element of the set (the positive Integers or an 24 ( twenty-four) is the Natural number following 23 and preceding 25. 26 ( twenty-six) is the Natural number following 25 and preceding 27.

 0 10 20 30 40 50 60 70 80 90 → Cardinal 25twenty five Ordinal 25thtwenty-fifth Factorization $5^2 \,\!$ Divisors 1, 5, 25 Roman numeral XXV Binary 11001 Hexadecimal 19

## In mathematics

25 is a centered octagonal number and an automorphic number. A centered octagonal number is a centered Figurate number that represents an Octagon with a dot in the center and all other dots surrounding the center In Mathematics an automorphic number (sometimes referred to as a circular number) is a Number whose square "ends" in the number itself

25 has an aliquot sum of 6 and is the first number to have an aliquot sequence that does not culminate in 0 through a prime. In Mathematics, and specifically in Number theory, a divisor function is an Arithmetical function related to the Divisors of an Integer In Mathematics, an aliquot sequence is a recursive sequence in which each term is the sum of the Proper divisors of the previous term In Mathematics, a prime number (or a prime) is a Natural number which has exactly two distinct natural number Divisors 1

It is the smallest base 10 Friedman number as it can be expressed by its own numbers: 5². The decimal ( base ten or occasionally denary) Numeral system has ten as its base. A Friedman number is an Integer which in a given base is the result of an expression using all its own digits in combination with any of the four basic arithmetic operators

It is also a Cullen number. In Mathematics, a Cullen number is a Natural number of the form n · 2 n + 1 (written C n) 25 is the smallest pseudoprime satisfying the congruence 7n = 7 mod n. A pseudoprime is a Probable prime (an Integer which shares a property common to all Prime numbers which is not actually prime It is also a Somer pseudoprime based on 6.

25 is the smallest aspiring number — a composite non-sociable number whose aliquot sequence does not terminate. In Mathematics, an aliquot sequence is a recursive sequence in which each term is the sum of the Proper divisors of the previous term Sociable numbers are generalizations of the concepts of Amicable numbers and Perfect numbers A set of sociable numbers is a kind of Aliquot sequence, or In Mathematics, an aliquot sequence is a recursive sequence in which each term is the sum of the Proper divisors of the previous term

According to the Shapiro inequality 25 is the least odd integer n such that there exist $x_1, x_2, \dots, x_n$ such that

$\sum_{i=1}^{n} \frac{x_i}{x_{i+1}+x_{i+2}} < \frac{n}{2}$

where xn + 1 = x1,xn + 2 = x2. In Mathematics, the Shapiro inequality is an Inequality due to H

Within base 10 one can readily test for divisibility by 25 by seeing if the last two digits of the number match 25, 50, 75 or 00.

11:25 is a magic number

## In religion

• In Ezekiel's vision of a new temple: The number twenty-five is of cardinal importance in Ezekiel's Temple Vision (in the Bible, Ezekiel chapters 40-48). See also List of elements by atomic number In Chemistry and Physics, the atomic number (also known as the proton Manganese (ˈmæŋgəniːz is a Chemical element, designated by the symbol Mn. According to religious texts Ezekiel ((יְחֶזְקֵאל Yehezkel, jəx According to religious texts Ezekiel ((יְחֶזְקֵאל Yehezkel, jəx According to religious texts Ezekiel ((יְחֶזְקֵאל Yehezkel, jəx

## In other fields

Twenty five is:

• The number of years of marriage marked in a silver wedding anniversary. A wedding anniversary is the Anniversary of the date on which a Wedding took place
• The minimum age of candidates for election to the United States House of Representatives. The United States House of Representatives is one of the two chambers of the United States Congress; the other is the Senate. "Under 25" provides a common cut-off point for designating youth. Youth is the period from infancy or childhood to maturity Usage Around the world the terms "youth" " Adolescent " "teenager" and
• The number of cents in a quarter. A quarter dollar is a coin worth 1/4 of a United States dollar, or 25 cents.
• The usual TCP port for SMTP. The Transmission Control Protocol (TCP is one of the core protocols of the Internet Protocol Suite. Simple Mail Transfer Protocol ( SMTP) is a De facto standard for electronic mail (e-mail transmissions across the Internet.
• The designation of United States Interstate 25, a freeway that runs from New Mexico to Wyoming. The United States of America —commonly referred to as the New Mexico ( is a state located in the southwestern region of the United States of America. The State of Wyoming ( is a sparsely populated state in the western region of the United States.
• The designation of the M25 London Orbital motorway. To see information about the M25 motorway under construction in Ireland, see N25 road. London ( ˈlʌndən is the capital and largest urban area in the United Kingdom.
• The (critical) number of Florida electoral votes for the 2000 U.S. presidential election. Florida ( is a state located in the southeastern region of the United States, bordering Alabama to the northwest and Georgia to the The United States presidential election of 2000 was a contest between Democratic candidate Al Gore, then Vice President, and Republican
• The name of the national card game of Ireland and India (Pachisi - Hindu for 25). Ireland (pronounced /ˈaɾlənd/ Éire) is the third largest island in Europe, and the twentieth-largest island in the world India, officially the Republic of India (भारत गणराज्य inc-Latn Bhārat Gaṇarājya; see also other Indian languages) is a country
• "25", a song by Veruca Salt from their 1994 album American Thighs
• TwentyFive is the name of a 2006 George Michael compilation celebrating 25 years in the music business (1981-2006). American Thighs is the debut Album by Alternative rock band Veruca Salt. For the album by Harry Connick Jr, please see 25 (album Twenty Five is Singer George Michael 's Georgios Kyriacos Panayiotou (Γεώργιος Κυριάκος Παναγιώτου (born 25 June 1963 best known as George Michael, is a two-time Grammy Award winning
• "25 boy", in Cantonese Chinese, is a slang term meaning "traitor" as used in the Chinese movie Over the Edge. Over the Edge is a movie completed in 1979 and released on HBO two years later because its controversial content led to a decision to forego
• In the UK, 'a pony' is slang for £25.
• The per-second frame rate of the PAL video standard. PAL, short for Phase Alternating Line, is a colour -encoding system used in Broadcast television systems in large parts of the world

## Historical years

25 A.D., 25 B.C., 1925, 2025, etc. Year 25 was a Common year starting on Monday (link will display the full calendar of the Julian calendar. Year 25 BC was a Leap year starting on Tuesday (link will display the full calendar of the Julian calendar. Year 1925 ( MCMXXV) was a Common year starting on Thursday (link will display the full calendar of the Gregorian calendar. 2025 ( MMXXV) will be a Common year starting on Wednesday of the Gregorian Calendar.

Christmas is on the 25th of December

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