20128997

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{101}}^1\times {\mathrm{401}}^1$

素因数の和:580

約数の個数: 16

約数和(自身を含む): 23618304

約数和(自身を除く): 3489307

約数列:

[1, 7, 71, 101, 401, 497, 707, 2807, 7171, 28471, 40501, 50197, 199297, 283507, 2875571, 20128997]

約数ペア:

[(1, 20128997), (7, 2875571), (71, 283507), (101, 199297), (401, 50197), (497, 40501), (707, 28471), (2807, 7171)]