26 (number)

26 (twenty-six) is the natural number following 25 and preceding 27.

List of numbers — Integers << 20 21 22 23 24 25 26 27 28 29 >>
Cardinal	twenty-six
Ordinal	twenty-sixth
Factorization	<math>2 \cdot 13<math>
Roman numeral	XXVI
Binary	11010
Hexadecimal	1A

In mathematics

Twenty-six is a composite number, its proper divisors being 1, 2, and 13. 26 is the only integer to lie between a square and a cube.

There is no answer to the equation φ(x) = 26, making 26 a nontotient. Nor is there an answer to x - φ(x) = 26, making 26 a noncototient.

In the classification of finite simple groups there are 26 sporadic groups.

In other fields

Twenty-six is:

• The atomic number of iron.
• The number of letters in the English alphabet, if majuscules are not distinguished from minuscules.
• The designation of Interstate 26, a freeway that runs from South Carolina to North Carolina.
• The number of spacetime dimensions in bosonic string theory.
• Often the number of episodes in a Japanese anime series. For example, Cowboy Bebop, Outlaw Star and Trigun.
• Historical years: 26 A.D., 26 B.C., or 1926

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