21205358

素因数分解:

$2^1\times {\mathrm{17}}^1\times {\mathrm{397}}^1\times {\mathrm{1571}}^1$

素因数の和:1987

約数の個数: 16

約数和(自身を含む): 33785424

約数和(自身を除く): 12580066

約数列:

[1, 2, 17, 34, 397, 794, 1571, 3142, 6749, 13498, 26707, 53414, 623687, 1247374, 10602679, 21205358]

約数ペア:

[(1, 21205358), (2, 10602679), (17, 1247374), (34, 623687), (397, 53414), (794, 26707), (1571, 13498), (3142, 6749)]