399119960

素因数分解:

$2^3\times 5^1\times {\mathrm{9977999}}^1$

素因数の和:9978010

約数の個数: 16

約数和(自身を含む): 898020000

約数和(自身を除く): 498900040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 9977999, 19955998, 39911996, 49889995, 79823992, 99779990, 199559980, 399119960]

約数ペア:

[(1, 399119960), (2, 199559980), (4, 99779990), (5, 79823992), (8, 49889995), (10, 39911996), (20, 19955998), (40, 9977999)]