19959920

素因数分解:

$2^4\times 5^1\times {\mathrm{249499}}^1$

素因数の和:249512

約数の個数: 20

約数和(自身を含む): 46407000

約数和(自身を除く): 26447080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249499, 498998, 997996, 1247495, 1995992, 2494990, 3991984, 4989980, 9979960, 19959920]

約数ペア:

[(1, 19959920), (2, 9979960), (4, 4989980), (5, 3991984), (8, 2494990), (10, 1995992), (16, 1247495), (20, 997996), (40, 498998), (80, 249499)]