20561009

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{823}}^1$

素因数の和:956

約数の個数: 16

約数和(自身を含む): 24364032

約数和(自身を除く): 3803023

約数列:

[1, 7, 43, 83, 301, 581, 823, 3569, 5761, 24983, 35389, 68309, 247723, 478163, 2937287, 20561009]

約数ペア:

[(1, 20561009), (7, 2937287), (43, 478163), (83, 247723), (301, 68309), (581, 35389), (823, 24983), (3569, 5761)]