21890979

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{311}}^1$

素因数の和:413

約数の個数: 40

約数和(自身を含む): 36241920

約数和(自身を除く): 14350941

約数列:

[1, 3, 9, 11, 27, 33, 79, 81, 99, 237, 297, 311, 711, 869, 891, 933, 2133, 2607, 2799, 3421, 6399, 7821, 8397, 10263, 23463, 24569, 25191, 30789, 70389, 73707, 92367, 221121, 270259, 277101, 663363, 810777, 1990089, 2432331, 7296993, 21890979]

約数ペア:

[(1, 21890979), (3, 7296993), (9, 2432331), (11, 1990089), (27, 810777), (33, 663363), (79, 277101), (81, 270259), (99, 221121), (237, 92367), (297, 73707), (311, 70389), (711, 30789), (869, 25191), (891, 24569), (933, 23463), (2133, 10263), (2607, 8397), (2799, 7821), (3421, 6399)]