18989991

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{19009}}^1$

素因数の和:19055

約数の個数: 16

約数和(自身を含む): 28895200

約数和(自身を除く): 9905209

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 19009, 57027, 171081, 513243, 703333, 2109999, 6329997, 18989991]

約数ペア:

[(1, 18989991), (3, 6329997), (9, 2109999), (27, 703333), (37, 513243), (111, 171081), (333, 57027), (999, 19009)]