20817910

素因数分解:

$2^1\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{269}}^1$

素因数の和:456

約数の個数: 32

約数和(自身を含む): 38491200

約数和(自身を除く): 17673290

約数列:

[1, 2, 5, 10, 71, 109, 142, 218, 269, 355, 538, 545, 710, 1090, 1345, 2690, 7739, 15478, 19099, 29321, 38198, 38695, 58642, 77390, 95495, 146605, 190990, 293210, 2081791, 4163582, 10408955, 20817910]

約数ペア:

[(1, 20817910), (2, 10408955), (5, 4163582), (10, 2081791), (71, 293210), (109, 190990), (142, 146605), (218, 95495), (269, 77390), (355, 58642), (538, 38695), (545, 38198), (710, 29321), (1090, 19099), (1345, 15478), (2690, 7739)]