21108490

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{397}}^1\times {\mathrm{409}}^1$

素因数の和:826

約数の個数: 32

約数和(自身を含む): 41121360

約数和(自身を除く): 20012870

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 397, 409, 794, 818, 1985, 2045, 3970, 4090, 5161, 5317, 10322, 10634, 25805, 26585, 51610, 53170, 162373, 324746, 811865, 1623730, 2110849, 4221698, 10554245, 21108490]

約数ペア:

[(1, 21108490), (2, 10554245), (5, 4221698), (10, 2110849), (13, 1623730), (26, 811865), (65, 324746), (130, 162373), (397, 53170), (409, 51610), (794, 26585), (818, 25805), (1985, 10634), (2045, 10322), (3970, 5317), (4090, 5161)]