19990989

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{20011}}^1$

素因数の和:20057

約数の個数: 16

約数和(自身を含む): 30418240

約数和(自身を除く): 10427251

約数列:

[1, 3, 9, 27, 37, 111, 333, 999, 20011, 60033, 180099, 540297, 740407, 2221221, 6663663, 19990989]

約数ペア:

[(1, 19990989), (3, 6663663), (9, 2221221), (27, 740407), (37, 540297), (111, 180099), (333, 60033), (999, 20011)]