81611620

素因数分解:

$2^2\times 5^1\times {\mathrm{313}}^1\times {\mathrm{13037}}^1$

素因数の和:13359

約数の個数: 24

約数和(自身を含む): 171945144

約数和(自身を除く): 90333524

約数列:

[1, 2, 4, 5, 10, 20, 313, 626, 1252, 1565, 3130, 6260, 13037, 26074, 52148, 65185, 130370, 260740, 4080581, 8161162, 16322324, 20402905, 40805810, 81611620]

約数ペア:

[(1, 81611620), (2, 40805810), (4, 20402905), (5, 16322324), (10, 8161162), (20, 4080581), (313, 260740), (626, 130370), (1252, 65185), (1565, 52148), (3130, 26074), (6260, 13037)]