21296980

素因数分解:

$2^2\times 5^1\times {\mathrm{199}}^1\times {\mathrm{5351}}^1$

素因数の和:5559

約数の個数: 24

約数和(自身を含む): 44956800

約数和(自身を除く): 23659820

約数列:

[1, 2, 4, 5, 10, 20, 199, 398, 796, 995, 1990, 3980, 5351, 10702, 21404, 26755, 53510, 107020, 1064849, 2129698, 4259396, 5324245, 10648490, 21296980]

約数ペア:

[(1, 21296980), (2, 10648490), (4, 5324245), (5, 4259396), (10, 2129698), (20, 1064849), (199, 107020), (398, 53510), (796, 26755), (995, 21404), (1990, 10702), (3980, 5351)]