399635920

素因数分解:

$2^4\times 5^1\times {\mathrm{4995449}}^1$

素因数の和:4995462

約数の個数: 20

約数和(自身を含む): 929153700

約数和(自身を除く): 529517780

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4995449, 9990898, 19981796, 24977245, 39963592, 49954490, 79927184, 99908980, 199817960, 399635920]

約数ペア:

[(1, 399635920), (2, 199817960), (4, 99908980), (5, 79927184), (8, 49954490), (10, 39963592), (16, 24977245), (20, 19981796), (40, 9990898), (80, 4995449)]