19988680

素因数分解:

$2^3\times 5^1\times {\mathrm{499717}}^1$

素因数の和:499728

約数の個数: 16

約数和(自身を含む): 44974620

約数和(自身を除く): 24985940

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499717, 999434, 1998868, 2498585, 3997736, 4997170, 9994340, 19988680]

約数ペア:

[(1, 19988680), (2, 9994340), (4, 4997170), (5, 3997736), (8, 2498585), (10, 1998868), (20, 999434), (40, 499717)]