20972903

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{2221}}^1$

素因数の和:2318

約数の個数: 16

約数和(自身を含む): 25597440

約数和(自身を除く): 4624537

約数列:

[1, 7, 19, 71, 133, 497, 1349, 2221, 9443, 15547, 42199, 157691, 295393, 1103837, 2996129, 20972903]

約数ペア:

[(1, 20972903), (7, 2996129), (19, 1103837), (71, 295393), (133, 157691), (497, 42199), (1349, 15547), (2221, 9443)]