389999920

素因数分解:

$2^4\times 5^1\times {\mathrm{4874999}}^1$

素因数の和:4875012

約数の個数: 20

約数和(自身を含む): 906750000

約数和(自身を除く): 516750080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4874999, 9749998, 19499996, 24374995, 38999992, 48749990, 77999984, 97499980, 194999960, 389999920]

約数ペア:

[(1, 389999920), (2, 194999960), (4, 97499980), (5, 77999984), (8, 48749990), (10, 38999992), (16, 24374995), (20, 19499996), (40, 9749998), (80, 4874999)]