639453820

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{1390117}}^1$

素因数の和:1390149

約数の個数: 24

約数和(自身を含む): 1401238944

約数和(自身を除く): 761785124

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 92, 115, 230, 460, 1390117, 2780234, 5560468, 6950585, 13901170, 27802340, 31972691, 63945382, 127890764, 159863455, 319726910, 639453820]

約数ペア:

[(1, 639453820), (2, 319726910), (4, 159863455), (5, 127890764), (10, 63945382), (20, 31972691), (23, 27802340), (46, 13901170), (92, 6950585), (115, 5560468), (230, 2780234), (460, 1390117)]