399909880

素因数分解:

$2^3\times 5^1\times {\mathrm{9997747}}^1$

素因数の和:9997758

約数の個数: 16

約数和(自身を含む): 899797320

約数和(自身を除く): 499887440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 9997747, 19995494, 39990988, 49988735, 79981976, 99977470, 199954940, 399909880]

約数ペア:

[(1, 399909880), (2, 199954940), (4, 99977470), (5, 79981976), (8, 49988735), (10, 39990988), (20, 19995494), (40, 9997747)]