21252820

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9749}}^1$

素因数の和:9867

約数の個数: 24

約数和(自身を含む): 45045000

約数和(自身を除く): 23792180

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9749, 19498, 38996, 48745, 97490, 194980, 1062641, 2125282, 4250564, 5313205, 10626410, 21252820]

約数ペア:

[(1, 21252820), (2, 10626410), (4, 5313205), (5, 4250564), (10, 2125282), (20, 1062641), (109, 194980), (218, 97490), (436, 48745), (545, 38996), (1090, 19498), (2180, 9749)]