20581617

素因数分解:

$3^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{7369}}^1$

素因数の和:7405

約数の個数: 24

約数和(自身を含む): 33607200

約数和(自身を除く): 13025583

約数列:

[1, 3, 7, 19, 21, 49, 57, 133, 147, 399, 931, 2793, 7369, 22107, 51583, 140011, 154749, 361081, 420033, 980077, 1083243, 2940231, 6860539, 20581617]

約数ペア:

[(1, 20581617), (3, 6860539), (7, 2940231), (19, 1083243), (21, 980077), (49, 420033), (57, 361081), (133, 154749), (147, 140011), (399, 51583), (931, 22107), (2793, 7369)]