21191120

素因数分解:

$2^4\times 5^1\times {\mathrm{264889}}^1$

素因数の和:264902

約数の個数: 20

約数和(自身を含む): 49269540

約数和(自身を除く): 28078420

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264889, 529778, 1059556, 1324445, 2119112, 2648890, 4238224, 5297780, 10595560, 21191120]

約数ペア:

[(1, 21191120), (2, 10595560), (4, 5297780), (5, 4238224), (8, 2648890), (10, 2119112), (16, 1324445), (20, 1059556), (40, 529778), (80, 264889)]