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230 (number) : ウィキペディア英語版 | 230 (number)
230 (''two hundred () thirty'') is the natural number following 229 and preceding 231. ==In mathematics== It is a composite number, with its divisors being 2, 5, 10, 23, 46, and 115. Its factorisation makes it a sphenic number. There is no integer with 230 coprimes below it, thus 230 is a nontotient. However, the sum of the coprime counts for the first 27 integers is 230. There are 230 unique space groups describing all possible crystal symmetries. In base 10, being divisible by the sum of its digits, 230 is a Harshad number.
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