20198990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{2857}}^1$

素因数の和:2972

約数の個数: 32

約数和(自身を含む): 41978304

約数和(自身を除く): 21779314

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 101, 202, 505, 707, 1010, 1414, 2857, 3535, 5714, 7070, 14285, 19999, 28570, 39998, 99995, 199990, 288557, 577114, 1442785, 2019899, 2885570, 4039798, 10099495, 20198990]

約数ペア:

[(1, 20198990), (2, 10099495), (5, 4039798), (7, 2885570), (10, 2019899), (14, 1442785), (35, 577114), (70, 288557), (101, 199990), (202, 99995), (505, 39998), (707, 28570), (1010, 19999), (1414, 14285), (2857, 7070), (3535, 5714)]