21267880

素因数分解:

$2^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{3881}}^1$

素因数の和:4029

約数の個数: 32

約数和(自身を含む): 48214440

約数和(自身を除く): 26946560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 137, 274, 548, 685, 1096, 1370, 2740, 3881, 5480, 7762, 15524, 19405, 31048, 38810, 77620, 155240, 531697, 1063394, 2126788, 2658485, 4253576, 5316970, 10633940, 21267880]

約数ペア:

[(1, 21267880), (2, 10633940), (4, 5316970), (5, 4253576), (8, 2658485), (10, 2126788), (20, 1063394), (40, 531697), (137, 155240), (274, 77620), (548, 38810), (685, 31048), (1096, 19405), (1370, 15524), (2740, 7762), (3881, 5480)]