20721463

素因数分解:

$7^2\times {\mathrm{53}}^1\times {\mathrm{79}}^1\times {\mathrm{101}}^1$

素因数の和:247

約数の個数: 24

約数和(自身を含む): 25116480

約数和(自身を除く): 4395017

約数列:

[1, 7, 49, 53, 79, 101, 371, 553, 707, 2597, 3871, 4187, 4949, 5353, 7979, 29309, 37471, 55853, 205163, 262297, 390971, 422887, 2960209, 20721463]

約数ペア:

[(1, 20721463), (7, 2960209), (49, 422887), (53, 390971), (79, 262297), (101, 205163), (371, 55853), (553, 37471), (707, 29309), (2597, 7979), (3871, 5353), (4187, 4949)]