64687640

素因数分解:

$2^3\times 5^1\times {\mathrm{809}}^1\times {\mathrm{1999}}^1$

素因数の和:2819

約数の個数: 32

約数和(自身を含む): 145800000

約数和(自身を除く): 81112360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 809, 1618, 1999, 3236, 3998, 4045, 6472, 7996, 8090, 9995, 15992, 16180, 19990, 32360, 39980, 79960, 1617191, 3234382, 6468764, 8085955, 12937528, 16171910, 32343820, 64687640]

約数ペア:

[(1, 64687640), (2, 32343820), (4, 16171910), (5, 12937528), (8, 8085955), (10, 6468764), (20, 3234382), (40, 1617191), (809, 79960), (1618, 39980), (1999, 32360), (3236, 19990), (3998, 16180), (4045, 15992), (6472, 9995), (7996, 8090)]