18909820

素因数分解:

$2^2\times 5^1\times {\mathrm{211}}^1\times {\mathrm{4481}}^1$

素因数の和:4701

約数の個数: 24

約数和(自身を含む): 39907728

約数和(自身を除く): 20997908

約数列:

[1, 2, 4, 5, 10, 20, 211, 422, 844, 1055, 2110, 4220, 4481, 8962, 17924, 22405, 44810, 89620, 945491, 1890982, 3781964, 4727455, 9454910, 18909820]

約数ペア:

[(1, 18909820), (2, 9454910), (4, 4727455), (5, 3781964), (10, 1890982), (20, 945491), (211, 89620), (422, 44810), (844, 22405), (1055, 17924), (2110, 8962), (4220, 4481)]