18787221

素因数分解:

$3^4\times {\mathrm{137}}^1\times {\mathrm{1693}}^1$

素因数の和:1842

約数の個数: 20

約数和(自身を含む): 28286412

約数和(自身を除く): 9499191

約数列:

[1, 3, 9, 27, 81, 137, 411, 1233, 1693, 3699, 5079, 11097, 15237, 45711, 137133, 231941, 695823, 2087469, 6262407, 18787221]

約数ペア:

[(1, 18787221), (3, 6262407), (9, 2087469), (27, 695823), (81, 231941), (137, 137133), (411, 45711), (1233, 15237), (1693, 11097), (3699, 5079)]