21987790

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{199889}}^1$

素因数の和:199907

約数の個数: 16

約数和(自身を含む): 43176240

約数和(自身を除く): 21188450

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 199889, 399778, 999445, 1998890, 2198779, 4397558, 10993895, 21987790]

約数ペア:

[(1, 21987790), (2, 10993895), (5, 4397558), (10, 2198779), (11, 1998890), (22, 999445), (55, 399778), (110, 199889)]