639580

素因数分解:

$2^2\times 5^1\times {\mathrm{113}}^1\times {\mathrm{283}}^1$

素因数の和:405

約数の個数: 24

約数和(自身を含む): 1359792

約数和(自身を除く): 720212

約数列:

[1, 2, 4, 5, 10, 20, 113, 226, 283, 452, 565, 566, 1130, 1132, 1415, 2260, 2830, 5660, 31979, 63958, 127916, 159895, 319790, 639580]

約数ペア:

[(1, 639580), (2, 319790), (4, 159895), (5, 127916), (10, 63958), (20, 31979), (113, 5660), (226, 2830), (283, 2260), (452, 1415), (565, 1132), (566, 1130)]