21091580

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2711}}^1$

素因数の和:3109

約数の個数: 24

約数和(自身を含む): 44422560

約数和(自身を除く): 23330980

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2711, 3890, 5422, 7780, 10844, 13555, 27110, 54220, 1054579, 2109158, 4218316, 5272895, 10545790, 21091580]

約数ペア:

[(1, 21091580), (2, 10545790), (4, 5272895), (5, 4218316), (10, 2109158), (20, 1054579), (389, 54220), (778, 27110), (1556, 13555), (1945, 10844), (2711, 7780), (3890, 5422)]