20988513

素因数分解:

$3^2\times 7^3\times {\mathrm{13}}^1\times {\mathrm{523}}^1$

素因数の和:563

約数の個数: 48

約数和(自身を含む): 38147200

約数和(自身を除く): 17158687

約数列:

[1, 3, 7, 9, 13, 21, 39, 49, 63, 91, 117, 147, 273, 343, 441, 523, 637, 819, 1029, 1569, 1911, 3087, 3661, 4459, 4707, 5733, 6799, 10983, 13377, 20397, 25627, 32949, 40131, 47593, 61191, 76881, 142779, 179389, 230643, 333151, 428337, 538167, 999453, 1614501, 2332057, 2998359, 6996171, 20988513]

約数ペア:

[(1, 20988513), (3, 6996171), (7, 2998359), (9, 2332057), (13, 1614501), (21, 999453), (39, 538167), (49, 428337), (63, 333151), (91, 230643), (117, 179389), (147, 142779), (273, 76881), (343, 61191), (441, 47593), (523, 40131), (637, 32949), (819, 25627), (1029, 20397), (1569, 13377), (1911, 10983), (3087, 6799), (3661, 5733), (4459, 4707)]