401980

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{199}}^1$

素因数の和:309

約数の個数: 24

約数和(自身を含む): 856800

約数和(自身を除く): 454820

約数列:

[1, 2, 4, 5, 10, 20, 101, 199, 202, 398, 404, 505, 796, 995, 1010, 1990, 2020, 3980, 20099, 40198, 80396, 100495, 200990, 401980]

約数ペア:

[(1, 401980), (2, 200990), (4, 100495), (5, 80396), (10, 40198), (20, 20099), (101, 3980), (199, 2020), (202, 1990), (398, 1010), (404, 995), (505, 796)]