20979

素因数分解:

$3^4\times 7^1\times {\mathrm{37}}^1$

素因数の和:56

約数の個数: 20

約数和(自身を含む): 36784

約数和(自身を除く): 15805

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 111, 189, 259, 333, 567, 777, 999, 2331, 2997, 6993, 20979]

約数ペア:

[(1, 20979), (3, 6993), (7, 2997), (9, 2331), (21, 999), (27, 777), (37, 567), (63, 333), (81, 259), (111, 189)]