21052105

素因数分解:

$5^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1\times {\mathrm{421}}^1$

素因数の和:636

約数の個数: 16

約数和(自身を含む): 25856784

約数和(自身を除く): 4804679

約数列:

[1, 5, 73, 137, 365, 421, 685, 2105, 10001, 30733, 50005, 57677, 153665, 288385, 4210421, 21052105]

約数ペア:

[(1, 21052105), (5, 4210421), (73, 288385), (137, 153665), (365, 57677), (421, 50005), (685, 30733), (2105, 10001)]