21178661

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{991}}^1$

素因数の和:1112

約数の個数: 16

約数和(自身を含む): 25141248

約数和(自身を除く): 3962587

約数列:

[1, 7, 43, 71, 301, 497, 991, 3053, 6937, 21371, 42613, 70361, 298291, 492527, 3025523, 21178661]

約数ペア:

[(1, 21178661), (7, 3025523), (43, 492527), (71, 298291), (301, 70361), (497, 42613), (991, 21371), (3053, 6937)]