18658171

素因数分解:

$7^4\times {\mathrm{19}}^1\times {\mathrm{409}}^1$

素因数の和:456

約数の個数: 20

約数和(自身を含む): 22968200

約数和(自身を除く): 4310029

約数列:

[1, 7, 19, 49, 133, 343, 409, 931, 2401, 2863, 6517, 7771, 20041, 45619, 54397, 140287, 380779, 982009, 2665453, 18658171]

約数ペア:

[(1, 18658171), (7, 2665453), (19, 982009), (49, 380779), (133, 140287), (343, 54397), (409, 45619), (931, 20041), (2401, 7771), (2863, 6517)]