21405861

素因数分解:

$3^2\times {\mathrm{71}}^1\times {\mathrm{139}}^1\times {\mathrm{241}}^1$

素因数の和:457

約数の個数: 24

約数和(自身を含む): 31711680

約数和(自身を除く): 10305819

約数列:

[1, 3, 9, 71, 139, 213, 241, 417, 639, 723, 1251, 2169, 9869, 17111, 29607, 33499, 51333, 88821, 100497, 153999, 301491, 2378429, 7135287, 21405861]

約数ペア:

[(1, 21405861), (3, 7135287), (9, 2378429), (71, 301491), (139, 153999), (213, 100497), (241, 88821), (417, 51333), (639, 33499), (723, 29607), (1251, 17111), (2169, 9869)]