19968641

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 26323968

約数和(自身を除く): 6355327

約数列:

[1, 7, 11, 37, 43, 77, 163, 259, 301, 407, 473, 1141, 1591, 1793, 2849, 3311, 6031, 7009, 11137, 12551, 17501, 42217, 49063, 66341, 77099, 122507, 259333, 464387, 539693, 1815331, 2852663, 19968641]

約数ペア:

[(1, 19968641), (7, 2852663), (11, 1815331), (37, 539693), (43, 464387), (77, 259333), (163, 122507), (259, 77099), (301, 66341), (407, 49063), (473, 42217), (1141, 17501), (1591, 12551), (1793, 11137), (2849, 7009), (3311, 6031)]