21805165

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1\times {\mathrm{257}}^1$

素因数の和:572

約数の個数: 16

約数和(自身を含む): 26749440

約数和(自身を除く): 4944275

約数列:

[1, 5, 71, 239, 257, 355, 1195, 1285, 16969, 18247, 61423, 84845, 91235, 307115, 4361033, 21805165]

約数ペア:

[(1, 21805165), (5, 4361033), (71, 307115), (239, 91235), (257, 84845), (355, 61423), (1195, 18247), (1285, 16969)]