230 (number)

230 (two hundred [and] thirty) is the natural number following 229 and preceding 231.

Additionally, 230 is:
 * a composite number, with its divisors being 2, 5, 10, 23, 46, and 115.
 * a sphenic number because it is the product of 3 primes. It is also the first sphenic number to immediately precede another sphenic number.
 * palindromic and a repdigit in bases 22 (AA22), 45 (5545), 114 (22114), 229 (11229)
 * a Harshad number in bases 2, 6, 10, 12, 23 (and 16 other bases).
 * a happy number.
 * a nontotient since there is no integer with 230 coprimes below it.
 * the sum of the coprime counts for the first 27 integers.
 * the aliquot sum of both 454 and 52441.
 * part of the 41-aliquot tree.
 * the maximal number of pieces that can be obtained by cutting an annulus with 20 cuts.

The aliquot sequence starting at 224 is: 224, 280, 440, 640, 890, 730, 602, 454, 230, 202, 104, 106, 56, 64, 63, 41, 1, 0.

There are 230 unique space groups describing all possible crystal symmetries.