19908080

素因数分解:

$2^4\times 5^1\times {\mathrm{248851}}^1$

素因数の和:248864

約数の個数: 20

約数和(自身を含む): 46286472

約数和(自身を除く): 26378392

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248851, 497702, 995404, 1244255, 1990808, 2488510, 3981616, 4977020, 9954040, 19908080]

約数ペア:

[(1, 19908080), (2, 9954040), (4, 4977020), (5, 3981616), (8, 2488510), (10, 1990808), (16, 1244255), (20, 995404), (40, 497702), (80, 248851)]