19989109

素因数分解:

$7^2\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{179}}^1$

素因数の和:289

約数の個数: 24

約数和(自身を含む): 24377760

約数和(自身を除く): 4388651

約数列:

[1, 7, 43, 49, 53, 179, 301, 371, 1253, 2107, 2279, 2597, 7697, 8771, 9487, 15953, 53879, 66409, 111671, 377153, 407941, 464863, 2855587, 19989109]

約数ペア:

[(1, 19989109), (7, 2855587), (43, 464863), (49, 407941), (53, 377153), (179, 111671), (301, 66409), (371, 53879), (1253, 15953), (2107, 9487), (2279, 8771), (2597, 7697)]