21978902

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{14071}}^1$

素因数の和:14155

約数の個数: 16

約数和(自身を含む): 36474624

約数和(自身を除く): 14495722

約数列:

[1, 2, 11, 22, 71, 142, 781, 1562, 14071, 28142, 154781, 309562, 999041, 1998082, 10989451, 21978902]

約数ペア:

[(1, 21978902), (2, 10989451), (11, 1998082), (22, 999041), (71, 309562), (142, 154781), (781, 28142), (1562, 14071)]