20399980

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10099}}^1$

素因数の和:10209

約数の個数: 24

約数和(自身を含む): 43268400

約数和(自身を除く): 22868420

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10099, 20198, 40396, 50495, 100990, 201980, 1019999, 2039998, 4079996, 5099995, 10199990, 20399980]

約数ペア:

[(1, 20399980), (2, 10199990), (4, 5099995), (5, 4079996), (10, 2039998), (20, 1019999), (101, 201980), (202, 100990), (404, 50495), (505, 40396), (1010, 20198), (2020, 10099)]