20961685

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{137}}^1\times {\mathrm{431}}^1$

素因数の和:644

約数の個数: 16

約数和(自身を含む): 25754112

約数和(自身を除く): 4792427

約数列:

[1, 5, 71, 137, 355, 431, 685, 2155, 9727, 30601, 48635, 59047, 153005, 295235, 4192337, 20961685]

約数ペア:

[(1, 20961685), (5, 4192337), (71, 295235), (137, 153005), (355, 59047), (431, 48635), (685, 30601), (2155, 9727)]