21561220

素因数分解:

$2^2\times 5^1\times {\mathrm{349}}^1\times {\mathrm{3089}}^1$

素因数の和:3447

約数の個数: 24

約数和(自身を含む): 45423000

約数和(自身を除く): 23861780

約数列:

[1, 2, 4, 5, 10, 20, 349, 698, 1396, 1745, 3089, 3490, 6178, 6980, 12356, 15445, 30890, 61780, 1078061, 2156122, 4312244, 5390305, 10780610, 21561220]

約数ペア:

[(1, 21561220), (2, 10780610), (4, 5390305), (5, 4312244), (10, 2156122), (20, 1078061), (349, 61780), (698, 30890), (1396, 15445), (1745, 12356), (3089, 6980), (3490, 6178)]