19881207

素因数分解:

$3^4\times {\mathrm{71}}^1\times {\mathrm{3457}}^1$

素因数の和:3540

約数の個数: 20

約数和(自身を含む): 30126096

約数和(自身を除く): 10244889

約数列:

[1, 3, 9, 27, 71, 81, 213, 639, 1917, 3457, 5751, 10371, 31113, 93339, 245447, 280017, 736341, 2209023, 6627069, 19881207]

約数ペア:

[(1, 19881207), (3, 6627069), (9, 2209023), (27, 736341), (71, 280017), (81, 245447), (213, 93339), (639, 31113), (1917, 10371), (3457, 5751)]