19580

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1$

素因数の和:109

約数の個数: 24

約数和(自身を含む): 45360

約数和(自身を除く): 25780

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1780, 1958, 3916, 4895, 9790, 19580]

約数ペア:

[(1, 19580), (2, 9790), (4, 4895), (5, 3916), (10, 1958), (11, 1780), (20, 979), (22, 890), (44, 445), (55, 356), (89, 220), (110, 178)]