21395960

素因数分解:

$2^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{3407}}^1$

素因数の和:3575

約数の個数: 32

約数和(自身を含む): 48461760

約数和(自身を除く): 27065800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 157, 314, 628, 785, 1256, 1570, 3140, 3407, 6280, 6814, 13628, 17035, 27256, 34070, 68140, 136280, 534899, 1069798, 2139596, 2674495, 4279192, 5348990, 10697980, 21395960]

約数ペア:

[(1, 21395960), (2, 10697980), (4, 5348990), (5, 4279192), (8, 2674495), (10, 2139596), (20, 1069798), (40, 534899), (157, 136280), (314, 68140), (628, 34070), (785, 27256), (1256, 17035), (1570, 13628), (3140, 6814), (3407, 6280)]