19810090

素因数分解:

$2^1\times 5^1\times {\mathrm{991}}^1\times {\mathrm{1999}}^1$

素因数の和:2997

約数の個数: 16

約数和(自身を含む): 35712000

約数和(自身を除く): 15901910

約数列:

[1, 2, 5, 10, 991, 1982, 1999, 3998, 4955, 9910, 9995, 19990, 1981009, 3962018, 9905045, 19810090]

約数ペア:

[(1, 19810090), (2, 9905045), (5, 3962018), (10, 1981009), (991, 19990), (1982, 9995), (1999, 9910), (3998, 4955)]