398660

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{643}}^1$

素因数の和:683

約数の個数: 24

約数和(自身を含む): 865536

約数和(自身を除く): 466876

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 643, 1286, 2572, 3215, 6430, 12860, 19933, 39866, 79732, 99665, 199330, 398660]

約数ペア:

[(1, 398660), (2, 199330), (4, 99665), (5, 79732), (10, 39866), (20, 19933), (31, 12860), (62, 6430), (124, 3215), (155, 2572), (310, 1286), (620, 643)]