21055727

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{8821}}^1$

素因数の和:8870

約数の個数: 16

約数和(自身を含む): 27101184

約数和(自身を除く): 6045457

約数列:

[1, 7, 11, 31, 77, 217, 341, 2387, 8821, 61747, 97031, 273451, 679217, 1914157, 3007961, 21055727]

約数ペア:

[(1, 21055727), (7, 3007961), (11, 1914157), (31, 679217), (77, 273451), (217, 97031), (341, 61747), (2387, 8821)]