19891640

素因数分解:

$2^3\times 5^1\times {\mathrm{497291}}^1$

素因数の和:497302

約数の個数: 16

約数和(自身を含む): 44756280

約数和(自身を除く): 24864640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 497291, 994582, 1989164, 2486455, 3978328, 4972910, 9945820, 19891640]

約数ペア:

[(1, 19891640), (2, 9945820), (4, 4972910), (5, 3978328), (8, 2486455), (10, 1989164), (20, 994582), (40, 497291)]