21687980

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{6907}}^1$

素因数の和:7073

約数の個数: 24

約数和(自身を含む): 45841488

約数和(自身を除く): 24153508

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 6907, 13814, 27628, 34535, 69070, 138140, 1084399, 2168798, 4337596, 5421995, 10843990, 21687980]

約数ペア:

[(1, 21687980), (2, 10843990), (4, 5421995), (5, 4337596), (10, 2168798), (20, 1084399), (157, 138140), (314, 69070), (628, 34535), (785, 27628), (1570, 13814), (3140, 6907)]