20668580

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{499}}^1$

素因数の和:636

約数の個数: 48

約数和(自身を含む): 46200000

約数和(自身を除く): 25531420

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 109, 190, 218, 380, 436, 499, 545, 998, 1090, 1996, 2071, 2180, 2495, 4142, 4990, 8284, 9481, 9980, 10355, 18962, 20710, 37924, 41420, 47405, 54391, 94810, 108782, 189620, 217564, 271955, 543910, 1033429, 1087820, 2066858, 4133716, 5167145, 10334290, 20668580]

約数ペア:

[(1, 20668580), (2, 10334290), (4, 5167145), (5, 4133716), (10, 2066858), (19, 1087820), (20, 1033429), (38, 543910), (76, 271955), (95, 217564), (109, 189620), (190, 108782), (218, 94810), (380, 54391), (436, 47405), (499, 41420), (545, 37924), (998, 20710), (1090, 18962), (1996, 10355), (2071, 9980), (2180, 9481), (2495, 8284), (4142, 4990)]