20654500

素因数分解:

$2^2\times 5^3\times {\mathrm{101}}^1\times {\mathrm{409}}^1$

素因数の和:529

約数の個数: 48

約数和(自身を含む): 45667440

約数和(自身を除く): 25012940

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 101, 125, 202, 250, 404, 409, 500, 505, 818, 1010, 1636, 2020, 2045, 2525, 4090, 5050, 8180, 10100, 10225, 12625, 20450, 25250, 40900, 41309, 50500, 51125, 82618, 102250, 165236, 204500, 206545, 413090, 826180, 1032725, 2065450, 4130900, 5163625, 10327250, 20654500]

約数ペア:

[(1, 20654500), (2, 10327250), (4, 5163625), (5, 4130900), (10, 2065450), (20, 1032725), (25, 826180), (50, 413090), (100, 206545), (101, 204500), (125, 165236), (202, 102250), (250, 82618), (404, 51125), (409, 50500), (500, 41309), (505, 40900), (818, 25250), (1010, 20450), (1636, 12625), (2020, 10225), (2045, 10100), (2525, 8180), (4090, 5050)]