20981615

素因数分解:

$5^1\times {\mathrm{103}}^1\times {\mathrm{131}}^1\times {\mathrm{311}}^1$

素因数の和:550

約数の個数: 16

約数和(自身を含む): 25698816

約数和(自身を除く): 4717201

約数列:

[1, 5, 103, 131, 311, 515, 655, 1555, 13493, 32033, 40741, 67465, 160165, 203705, 4196323, 20981615]

約数ペア:

[(1, 20981615), (5, 4196323), (103, 203705), (131, 160165), (311, 67465), (515, 40741), (655, 32033), (1555, 13493)]