21191780

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9721}}^1$

素因数の和:9839

約数の個数: 24

約数和(自身を含む): 44915640

約数和(自身を除く): 23723860

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9721, 19442, 38884, 48605, 97210, 194420, 1059589, 2119178, 4238356, 5297945, 10595890, 21191780]

約数ペア:

[(1, 21191780), (2, 10595890), (4, 5297945), (5, 4238356), (10, 2119178), (20, 1059589), (109, 194420), (218, 97210), (436, 48605), (545, 38884), (1090, 19442), (2180, 9721)]