642220

素因数分解:

$2^2\times 5^1\times {\mathrm{163}}^1\times {\mathrm{197}}^1$

素因数の和:369

約数の個数: 24

約数和(自身を含む): 1363824

約数和(自身を除く): 721604

約数列:

[1, 2, 4, 5, 10, 20, 163, 197, 326, 394, 652, 788, 815, 985, 1630, 1970, 3260, 3940, 32111, 64222, 128444, 160555, 321110, 642220]

約数ペア:

[(1, 642220), (2, 321110), (4, 160555), (5, 128444), (10, 64222), (20, 32111), (163, 3940), (197, 3260), (326, 1970), (394, 1630), (652, 985), (788, 815)]