998980

素因数分解:

$2^2\times 5^1\times {\mathrm{199}}^1\times {\mathrm{251}}^1$

素因数の和:459

約数の個数: 24

約数和(自身を含む): 2116800

約数和(自身を除く): 1117820

約数列:

[1, 2, 4, 5, 10, 20, 199, 251, 398, 502, 796, 995, 1004, 1255, 1990, 2510, 3980, 5020, 49949, 99898, 199796, 249745, 499490, 998980]

約数ペア:

[(1, 998980), (2, 499490), (4, 249745), (5, 199796), (10, 99898), (20, 49949), (199, 5020), (251, 3980), (398, 2510), (502, 1990), (796, 1255), (995, 1004)]