20721365

素因数分解:

$5^1\times 7^2\times {\mathrm{83}}^1\times {\mathrm{1019}}^1$

素因数の和:1121

約数の個数: 24

約数和(自身を含む): 29302560

約数和(自身を除く): 8581195

約数列:

[1, 5, 7, 35, 49, 83, 245, 415, 581, 1019, 2905, 4067, 5095, 7133, 20335, 35665, 49931, 84577, 249655, 422885, 592039, 2960195, 4144273, 20721365]

約数ペア:

[(1, 20721365), (5, 4144273), (7, 2960195), (35, 592039), (49, 422885), (83, 249655), (245, 84577), (415, 49931), (581, 35665), (1019, 20335), (2905, 7133), (4067, 5095)]