21990353

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{15031}}^1$

素因数の和:15068

約数の個数: 16

約数和(自身を含む): 28861440

約数和(自身を除く): 6871087

約数列:

[1, 7, 11, 19, 77, 133, 209, 1463, 15031, 105217, 165341, 285589, 1157387, 1999123, 3141479, 21990353]

約数ペア:

[(1, 21990353), (7, 3141479), (11, 1999123), (19, 1157387), (77, 285589), (133, 165341), (209, 105217), (1463, 15031)]