21187540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{193}}^1\times {\mathrm{499}}^1$

素因数の和:712

約数の個数: 48

約数和(自身を含む): 48888000

約数和(自身を除く): 27700460

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 193, 220, 386, 499, 772, 965, 998, 1930, 1996, 2123, 2495, 3860, 4246, 4990, 5489, 8492, 9980, 10615, 10978, 21230, 21956, 27445, 42460, 54890, 96307, 109780, 192614, 385228, 481535, 963070, 1059377, 1926140, 2118754, 4237508, 5296885, 10593770, 21187540]

約数ペア:

[(1, 21187540), (2, 10593770), (4, 5296885), (5, 4237508), (10, 2118754), (11, 1926140), (20, 1059377), (22, 963070), (44, 481535), (55, 385228), (110, 192614), (193, 109780), (220, 96307), (386, 54890), (499, 42460), (772, 27445), (965, 21956), (998, 21230), (1930, 10978), (1996, 10615), (2123, 9980), (2495, 8492), (3860, 5489), (4246, 4990)]