18991989

素因数分解:

$3^4\times {\mathrm{37}}^1\times {\mathrm{6337}}^1$

素因数の和:6386

約数の個数: 20

約数和(自身を含む): 29142124

約数和(自身を除く): 10150135

約数列:

[1, 3, 9, 27, 37, 81, 111, 333, 999, 2997, 6337, 19011, 57033, 171099, 234469, 513297, 703407, 2110221, 6330663, 18991989]

約数ペア:

[(1, 18991989), (3, 6330663), (9, 2110221), (27, 703407), (37, 513297), (81, 234469), (111, 171099), (333, 57033), (999, 19011), (2997, 6337)]