18991721

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{179}}^1\times {\mathrm{659}}^1$

素因数の和:868

約数の個数: 16

約数和(自身を含む): 22809600

約数和(自身を除く): 3817879

約数列:

[1, 7, 23, 161, 179, 659, 1253, 4117, 4613, 15157, 28819, 106099, 117961, 825727, 2713103, 18991721]

約数ペア:

[(1, 18991721), (7, 2713103), (23, 825727), (161, 117961), (179, 106099), (659, 28819), (1253, 15157), (4117, 4613)]