19780745

素因数分解:

$5^1\times {\mathrm{67}}^1\times {\mathrm{137}}^1\times {\mathrm{431}}^1$

素因数の和:640

約数の個数: 16

約数和(自身を含む): 24323328

約数和(自身を除く): 4542583

約数列:

[1, 5, 67, 137, 335, 431, 685, 2155, 9179, 28877, 45895, 59047, 144385, 295235, 3956149, 19780745]

約数ペア:

[(1, 19780745), (5, 3956149), (67, 295235), (137, 144385), (335, 59047), (431, 45895), (685, 28877), (2155, 9179)]