81319640

素因数分解:

$2^3\times 5^1\times {\mathrm{2032991}}^1$

素因数の和:2033002

約数の個数: 16

約数和(自身を含む): 182969280

約数和(自身を除く): 101649640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 2032991, 4065982, 8131964, 10164955, 16263928, 20329910, 40659820, 81319640]

約数ペア:

[(1, 81319640), (2, 40659820), (4, 20329910), (5, 16263928), (8, 10164955), (10, 8131964), (20, 4065982), (40, 2032991)]