18991557

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{887}}^1$

素因数の和:970

約数の個数: 32

約数和(自身を含む): 30831360

約数和(自身を除く): 11839803

約数列:

[1, 3, 9, 13, 27, 39, 61, 117, 183, 351, 549, 793, 887, 1647, 2379, 2661, 7137, 7983, 11531, 21411, 23949, 34593, 54107, 103779, 162321, 311337, 486963, 703391, 1460889, 2110173, 6330519, 18991557]

約数ペア:

[(1, 18991557), (3, 6330519), (9, 2110173), (13, 1460889), (27, 703391), (39, 486963), (61, 311337), (117, 162321), (183, 103779), (351, 54107), (549, 34593), (793, 23949), (887, 21411), (1647, 11531), (2379, 7983), (2661, 7137)]