18719990

素因数分解:

$2^1\times 5^1\times {\mathrm{991}}^1\times {\mathrm{1889}}^1$

素因数の和:2887

約数の個数: 16

約数和(自身を含む): 33747840

約数和(自身を除く): 15027850

約数列:

[1, 2, 5, 10, 991, 1889, 1982, 3778, 4955, 9445, 9910, 18890, 1871999, 3743998, 9359995, 18719990]

約数ペア:

[(1, 18719990), (2, 9359995), (5, 3743998), (10, 1871999), (991, 18890), (1889, 9910), (1982, 9445), (3778, 4955)]