21399021

素因数分解:

$3^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{10957}}^1$

素因数の和:11001

約数の個数: 24

約数和(自身を含む): 36468224

約数和(自身を除く): 15069203

約数列:

[1, 3, 7, 9, 21, 31, 63, 93, 217, 279, 651, 1953, 10957, 32871, 76699, 98613, 230097, 339667, 690291, 1019001, 2377669, 3057003, 7133007, 21399021]

約数ペア:

[(1, 21399021), (3, 7133007), (7, 3057003), (9, 2377669), (21, 1019001), (31, 690291), (63, 339667), (93, 230097), (217, 98613), (279, 76699), (651, 32871), (1953, 10957)]