81199960

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^2\times {\mathrm{199}}^1$

素因数の和:412

約数の個数: 48

約数和(自身を含む): 185454000

約数和(自身を除く): 104254040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 199, 202, 398, 404, 505, 796, 808, 995, 1010, 1592, 1990, 2020, 3980, 4040, 7960, 10201, 20099, 20402, 40198, 40804, 51005, 80396, 81608, 100495, 102010, 160792, 200990, 204020, 401980, 408040, 803960, 2029999, 4059998, 8119996, 10149995, 16239992, 20299990, 40599980, 81199960]

約数ペア:

[(1, 81199960), (2, 40599980), (4, 20299990), (5, 16239992), (8, 10149995), (10, 8119996), (20, 4059998), (40, 2029999), (101, 803960), (199, 408040), (202, 401980), (398, 204020), (404, 200990), (505, 160792), (796, 102010), (808, 100495), (995, 81608), (1010, 80396), (1592, 51005), (1990, 40804), (2020, 40198), (3980, 20402), (4040, 20099), (7960, 10201)]