18019989

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{157}}^1$

素因数の和:291

約数の個数: 40

約数和(自身を含む): 29441720

約数和(自身を除く): 11421731

約数列:

[1, 3, 9, 13, 27, 39, 81, 109, 117, 157, 327, 351, 471, 981, 1053, 1413, 1417, 2041, 2943, 4239, 4251, 6123, 8829, 12717, 12753, 17113, 18369, 38259, 51339, 55107, 114777, 154017, 165321, 222469, 462051, 667407, 1386153, 2002221, 6006663, 18019989]

約数ペア:

[(1, 18019989), (3, 6006663), (9, 2002221), (13, 1386153), (27, 667407), (39, 462051), (81, 222469), (109, 165321), (117, 154017), (157, 114777), (327, 55107), (351, 51339), (471, 38259), (981, 18369), (1053, 17113), (1413, 12753), (1417, 12717), (2041, 8829), (2943, 6123), (4239, 4251)]