21155981

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{8863}}^1$

素因数の和:8912

約数の個数: 16

約数和(自身を含む): 27230208

約数和(自身を除く): 6074227

約数列:

[1, 7, 11, 31, 77, 217, 341, 2387, 8863, 62041, 97493, 274753, 682451, 1923271, 3022283, 21155981]

約数ペア:

[(1, 21155981), (7, 3022283), (11, 1923271), (31, 682451), (77, 274753), (217, 97493), (341, 62041), (2387, 8863)]