Twenty-two
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 | |
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
Web links
Commons : Twenty-two - collection of images, videos, and audio files
Wiktionary: twenty-two - explanations of meanings, word origins, synonyms, translations
Individual evidence
- ↑ 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 .