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Twenty-four (24) is the natural number following twenty-three and preceding twenty-five. It is the factorial of 4 and a composite number, its proper divisors being 1, 2, 3, 4, 6, 8 and 12, making it a highly composite number, and its factorization is:

This number is also the sum of a twin prime (11 + 13).

Twenty-four is also

The Greek alphabet has twenty-four letters in its classical and modern form.

See also: twenty-two, twenty-three, twenty-five, twenty-six, integer, list of numbers.

This article is about the number. For the year AD 24, see 24. For the television series, see 24 (television).