399630680

素因数分解:

$2^3\times 5^1\times {\mathrm{9990767}}^1$

素因数の和:9990778

約数の個数: 16

約数和(自身を含む): 899169120

約数和(自身を除く): 499538440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 9990767, 19981534, 39963068, 49953835, 79926136, 99907670, 199815340, 399630680]

約数ペア:

[(1, 399630680), (2, 199815340), (4, 99907670), (5, 79926136), (8, 49953835), (10, 39963068), (20, 19981534), (40, 9990767)]