639609820

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{293399}}^1$

素因数の和:293517

約数の個数: 24

約数和(自身を含む): 1355508000

約数和(自身を除く): 715898180

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 293399, 586798, 1173596, 1466995, 2933990, 5867980, 31980491, 63960982, 127921964, 159902455, 319804910, 639609820]

約数ペア:

[(1, 639609820), (2, 319804910), (4, 159902455), (5, 127921964), (10, 63960982), (20, 31980491), (109, 5867980), (218, 2933990), (436, 1466995), (545, 1173596), (1090, 586798), (2180, 293399)]