21231020

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9739}}^1$

素因数の和:9857

約数の個数: 24

約数和(自身を含む): 44998800

約数和(自身を除く): 23767780

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9739, 19478, 38956, 48695, 97390, 194780, 1061551, 2123102, 4246204, 5307755, 10615510, 21231020]

約数ペア:

[(1, 21231020), (2, 10615510), (4, 5307755), (5, 4246204), (10, 2123102), (20, 1061551), (109, 194780), (218, 97390), (436, 48695), (545, 38956), (1090, 19478), (2180, 9739)]