28081557

素因数分解:

$3^2\times 7^2\times {\mathrm{37}}^1\times {\mathrm{1721}}^1$

素因数の和:1778

約数の個数: 36

約数和(自身を含む): 48488076

約数和(自身を除く): 20406519

約数列:

[1, 3, 7, 9, 21, 37, 49, 63, 111, 147, 259, 333, 441, 777, 1721, 1813, 2331, 5163, 5439, 12047, 15489, 16317, 36141, 63677, 84329, 108423, 191031, 252987, 445739, 573093, 758961, 1337217, 3120173, 4011651, 9360519, 28081557]

約数ペア:

[(1, 28081557), (3, 9360519), (7, 4011651), (9, 3120173), (21, 1337217), (37, 758961), (49, 573093), (63, 445739), (111, 252987), (147, 191031), (259, 108423), (333, 84329), (441, 63677), (777, 36141), (1721, 16317), (1813, 15489), (2331, 12047), (5163, 5439)]