21494889

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{149}}^1$

素因数の和:311

約数の個数: 40

約数和(自身を含む): 35065800

約数和(自身を除く): 13570911

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 137, 149, 351, 411, 447, 1053, 1233, 1341, 1781, 1937, 3699, 4023, 5343, 5811, 11097, 12069, 16029, 17433, 20413, 48087, 52299, 61239, 144261, 156897, 183717, 265369, 551151, 796107, 1653453, 2388321, 7164963, 21494889]

約数ペア:

[(1, 21494889), (3, 7164963), (9, 2388321), (13, 1653453), (27, 796107), (39, 551151), (81, 265369), (117, 183717), (137, 156897), (149, 144261), (351, 61239), (411, 52299), (447, 48087), (1053, 20413), (1233, 17433), (1341, 16029), (1781, 12069), (1937, 11097), (3699, 5811), (4023, 5343)]