720380

素因数分解:

$2^2\times 5^1\times {\mathrm{181}}^1\times {\mathrm{199}}^1$

素因数の和:389

約数の個数: 24

約数和(自身を含む): 1528800

約数和(自身を除く): 808420

約数列:

[1, 2, 4, 5, 10, 20, 181, 199, 362, 398, 724, 796, 905, 995, 1810, 1990, 3620, 3980, 36019, 72038, 144076, 180095, 360190, 720380]

約数ペア:

[(1, 720380), (2, 360190), (4, 180095), (5, 144076), (10, 72038), (20, 36019), (181, 3980), (199, 3620), (362, 1990), (398, 1810), (724, 995), (796, 905)]