398263820

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{642361}}^1$

素因数の和:642401

約数の個数: 24

約数和(自身を含む): 863334528

約数和(自身を除く): 465070708

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 642361, 1284722, 2569444, 3211805, 6423610, 12847220, 19913191, 39826382, 79652764, 99565955, 199131910, 398263820]

約数ペア:

[(1, 398263820), (2, 199131910), (4, 99565955), (5, 79652764), (10, 39826382), (20, 19913191), (31, 12847220), (62, 6423610), (124, 3211805), (155, 2569444), (310, 1284722), (620, 642361)]