20987239

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{701}}^1$

素因数の和:775

約数の個数: 24

約数和(自身を含む): 26889408

約数和(自身を除く): 5902169

約数列:

[1, 7, 13, 47, 49, 91, 329, 611, 637, 701, 2303, 4277, 4907, 9113, 29939, 32947, 34349, 63791, 230629, 428311, 446537, 1614403, 2998177, 20987239]

約数ペア:

[(1, 20987239), (7, 2998177), (13, 1614403), (47, 446537), (49, 428311), (91, 230629), (329, 63791), (611, 34349), (637, 32947), (701, 29939), (2303, 9113), (4277, 4907)]