20791640

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7321}}^1$

素因数の和:7403

約数の個数: 32

約数和(自身を含む): 47446560

約数和(自身を除く): 26654920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7321, 14642, 29284, 36605, 58568, 73210, 146420, 292840, 519791, 1039582, 2079164, 2598955, 4158328, 5197910, 10395820, 20791640]

約数ペア:

[(1, 20791640), (2, 10395820), (4, 5197910), (5, 4158328), (8, 2598955), (10, 2079164), (20, 1039582), (40, 519791), (71, 292840), (142, 146420), (284, 73210), (355, 58568), (568, 36605), (710, 29284), (1420, 14642), (2840, 7321)]