21481405

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{5501}}^1$

素因数の和:5588

約数の個数: 16

約数和(自身を含む): 28522368

約数和(自身を除く): 7040963

約数列:

[1, 5, 11, 55, 71, 355, 781, 3905, 5501, 27505, 60511, 302555, 390571, 1952855, 4296281, 21481405]

約数ペア:

[(1, 21481405), (5, 4296281), (11, 1952855), (55, 390571), (71, 302555), (355, 60511), (781, 27505), (3905, 5501)]