20189900

素因数分解:

$2^2\times 5^2\times {\mathrm{101}}^1\times {\mathrm{1999}}^1$

素因数の和:2114

約数の個数: 36

約数和(自身を含む): 44268000

約数和(自身を除く): 24078100

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 101, 202, 404, 505, 1010, 1999, 2020, 2525, 3998, 5050, 7996, 9995, 10100, 19990, 39980, 49975, 99950, 199900, 201899, 403798, 807596, 1009495, 2018990, 4037980, 5047475, 10094950, 20189900]

約数ペア:

[(1, 20189900), (2, 10094950), (4, 5047475), (5, 4037980), (10, 2018990), (20, 1009495), (25, 807596), (50, 403798), (100, 201899), (101, 199900), (202, 99950), (404, 49975), (505, 39980), (1010, 19990), (1999, 10100), (2020, 9995), (2525, 7996), (3998, 5050)]