21664321

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{409}}^1$

素因数の和:493

約数の個数: 24

約数和(自身を含む): 26922240

約数和(自身を除く): 5257919

約数列:

[1, 7, 23, 47, 49, 161, 329, 409, 1081, 1127, 2303, 2863, 7567, 9407, 19223, 20041, 52969, 65849, 134561, 442129, 460943, 941927, 3094903, 21664321]

約数ペア:

[(1, 21664321), (7, 3094903), (23, 941927), (47, 460943), (49, 442129), (161, 134561), (329, 65849), (409, 52969), (1081, 20041), (1127, 19223), (2303, 9407), (2863, 7567)]