Twenty-two

This article is about the number twenty-two . For the year 22 AD see 22 , for additional meanings see 22 (disambiguation) .

Twenty-two
22nd
presentation
Roman	XXII
dual	1 0110
Octal	26th
Duodecimal	1A
Hexadecimal	16
Morse code	· · - - - · · - - -
Chinese	二 十二
Mathematical properties
sign	positive
parity	straight
Factorization	${\displaystyle 2\cdot 11}$
Divider	1, 2, 11, 22

The twenty-two (22) is the natural number between twenty-one and twenty-three . She is straight .

Math

• 22 is a deficient number
• 22 is a pentagonal number
• 22 is a value of Euler's cumulative phi function
• 22 is the maximum number of segments obtained when a circle is intersected with 6 lines.
• 22 is a number from the Perrin series
• 22 is an Erdős-Woods number
• 22 is a Smith number in the decimal system
• As a fraction, 22/7 is a relatively good approximation for the circle number ${\displaystyle \pi }$

Web links

Commons : Twenty-two  - collection of images, videos, and audio files

Wiktionary: twenty-two  - explanations of meanings, word origins, synonyms, translations

Individual evidence

1. ↑ A002088. Sum of totient function: a (n) = Sum_ {k = 1..n} phi (k), cf. A000010. In: The On-Line Encyclopedia of Integer Sequences. Accessed February 13, 2018 .