21112880

素因数分解:

$2^4\times 5^1\times {\mathrm{263911}}^1$

素因数の和:263924

約数の個数: 20

約数和(自身を含む): 49087632

約数和(自身を除く): 27974752

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 263911, 527822, 1055644, 1319555, 2111288, 2639110, 4222576, 5278220, 10556440, 21112880]

約数ペア:

[(1, 21112880), (2, 10556440), (4, 5278220), (5, 4222576), (8, 2639110), (10, 2111288), (16, 1319555), (20, 1055644), (40, 527822), (80, 263911)]