21100820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81157}}^1$

素因数の和:81179

約数の個数: 24

約数和(自身を含む): 47720904

約数和(自身を除く): 26620084

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81157, 162314, 324628, 405785, 811570, 1055041, 1623140, 2110082, 4220164, 5275205, 10550410, 21100820]

約数ペア:

[(1, 21100820), (2, 10550410), (4, 5275205), (5, 4220164), (10, 2110082), (13, 1623140), (20, 1055041), (26, 811570), (52, 405785), (65, 324628), (130, 162314), (260, 81157)]