20805421

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{409}}^1$

素因数の和:485

約数の個数: 24

約数和(自身を含む): 26410560

約数和(自身を除く): 5605139

約数列:

[1, 7, 13, 43, 91, 169, 301, 409, 559, 1183, 2863, 3913, 5317, 7267, 17587, 37219, 50869, 69121, 123109, 228631, 483847, 1600417, 2972203, 20805421]

約数ペア:

[(1, 20805421), (7, 2972203), (13, 1600417), (43, 483847), (91, 228631), (169, 123109), (301, 69121), (409, 50869), (559, 37219), (1183, 17587), (2863, 7267), (3913, 5317)]