20902985

素因数分解:

$5^1\times {\mathrm{89}}^1\times {\mathrm{107}}^1\times {\mathrm{439}}^1$

素因数の和:640

約数の個数: 16

約数和(自身を含む): 25660800

約数和(自身を除く): 4757815

約数列:

[1, 5, 89, 107, 439, 445, 535, 2195, 9523, 39071, 46973, 47615, 195355, 234865, 4180597, 20902985]

約数ペア:

[(1, 20902985), (5, 4180597), (89, 234865), (107, 195355), (439, 47615), (445, 46973), (535, 39071), (2195, 9523)]