18780531

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{19}}^1\times {\mathrm{389}}^1$

素因数の和:440

約数の個数: 48

約数和(自身を含む): 33196800

約数和(自身を除く): 14416269

約数列:

[1, 3, 7, 11, 19, 21, 33, 57, 77, 121, 133, 209, 231, 363, 389, 399, 627, 847, 1167, 1463, 2299, 2541, 2723, 4279, 4389, 6897, 7391, 8169, 12837, 16093, 22173, 29953, 47069, 48279, 51737, 81301, 89859, 141207, 155211, 243903, 329483, 569107, 894311, 988449, 1707321, 2682933, 6260177, 18780531]

約数ペア:

[(1, 18780531), (3, 6260177), (7, 2682933), (11, 1707321), (19, 988449), (21, 894311), (33, 569107), (57, 329483), (77, 243903), (121, 155211), (133, 141207), (209, 89859), (231, 81301), (363, 51737), (389, 48279), (399, 47069), (627, 29953), (847, 22173), (1167, 16093), (1463, 12837), (2299, 8169), (2541, 7391), (2723, 6897), (4279, 4389)]