19800081

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{7309}}^1$

素因数の和:7365

約数の個数: 24

約数和(自身を含む): 33450560

約数和(自身を除く): 13650479

約数列:

[1, 3, 7, 9, 21, 43, 63, 129, 301, 387, 903, 2709, 7309, 21927, 51163, 65781, 153489, 314287, 460467, 942861, 2200009, 2828583, 6600027, 19800081]

約数ペア:

[(1, 19800081), (3, 6600027), (7, 2828583), (9, 2200009), (21, 942861), (43, 460467), (63, 314287), (129, 153489), (301, 65781), (387, 51163), (903, 21927), (2709, 7309)]