20989475

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{131}}^1$

素因数の和:200

約数の個数: 48

約数和(自身を含む): 30935520

約数和(自身を除く): 9946045

約数列:

[1, 5, 13, 17, 25, 29, 65, 85, 131, 145, 221, 325, 377, 425, 493, 655, 725, 1105, 1703, 1885, 2227, 2465, 3275, 3799, 5525, 6409, 8515, 9425, 11135, 12325, 18995, 28951, 32045, 42575, 49387, 55675, 64583, 94975, 144755, 160225, 246935, 322915, 723775, 839579, 1234675, 1614575, 4197895, 20989475]

約数ペア:

[(1, 20989475), (5, 4197895), (13, 1614575), (17, 1234675), (25, 839579), (29, 723775), (65, 322915), (85, 246935), (131, 160225), (145, 144755), (221, 94975), (325, 64583), (377, 55675), (425, 49387), (493, 42575), (655, 32045), (725, 28951), (1105, 18995), (1703, 12325), (1885, 11135), (2227, 9425), (2465, 8515), (3275, 6409), (3799, 5525)]