20921607

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{7723}}^1$

素因数の和:7779

約数の個数: 24

約数和(自身を含む): 35345024

約数和(自身を除く): 14423417

約数列:

[1, 3, 7, 9, 21, 43, 63, 129, 301, 387, 903, 2709, 7723, 23169, 54061, 69507, 162183, 332089, 486549, 996267, 2324623, 2988801, 6973869, 20921607]

約数ペア:

[(1, 20921607), (3, 6973869), (7, 2988801), (9, 2324623), (21, 996267), (43, 486549), (63, 332089), (129, 162183), (301, 69507), (387, 54061), (903, 23169), (2709, 7723)]