| ||||
---|---|---|---|---|
Cardinal | twenty-two | |||
Ordinal | 22nd (twenty-second) | |||
Factorization | 2 × 11 | |||
Divisors | 1, 2, 11, 22 | |||
Greek numeral | ΚΒ´ | |||
Roman numeral | XXII, xxii | |||
Binary | 101102 | |||
Ternary | 2113 | |||
Senary | 346 | |||
Octal | 268 | |||
Duodecimal | 1A12 | |||
Hexadecimal | 1616 |
22 (twenty-two) is the natural number following 21 and preceding 23.
22 is a semiprime, [1] a Smith number, and an Erdős–Woods number. [2] [3] is a commonly used approximation of the irrational number π, the ratio of the circumference of a circle to its diameter.
22 can read as "two twos", which is the only fixed point of John Conway's look-and-say function. [4]
The number 22 appears prominently within sporadic groups. The Mathieu group M22 is one of 26 sporadic finite simple groups, defined as the 3-transitive permutation representation on 22 points. [5] There are also 22 regular complex apeirohedra. [6]
22 has been proven to be a Lychrel number in base 2, [7] since after 4 steps it reaches 10110100, after 8 steps it reaches 1011101000, after 12 steps it reaches 101111010000, and in general after 4n steps it reaches a number consisting of 10, followed by n + 1 ones, followed by 01, followed by n + 1 zeros. This number obviously cannot be a palindrome, and none of the other numbers in the sequence are palindromes.
Twenty-two may also refer to:
a unit of length equal to 66 feet
Lo más normal es que el nombre tuviera que ver con la forma del número. Por ejemplo, el 11 era las banderillas, y el 22, los dos patitos o las monjas arrodilladas.