21780143

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{6899}}^1$

素因数の和:6958

約数の個数: 16

約数和(自身を含む): 27820800

約数和(自身を除く): 6040657

約数列:

[1, 7, 11, 41, 77, 287, 451, 3157, 6899, 48293, 75889, 282859, 531223, 1980013, 3111449, 21780143]

約数ペア:

[(1, 21780143), (7, 3111449), (11, 1980013), (41, 531223), (77, 282859), (287, 75889), (451, 48293), (3157, 6899)]