20865105

素因数分解:

$3^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{263}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 38054016

約数和(自身を除く): 17188911

約数列:

[1, 3, 5, 9, 15, 41, 43, 45, 123, 129, 205, 215, 263, 369, 387, 615, 645, 789, 1315, 1763, 1845, 1935, 2367, 3945, 5289, 8815, 10783, 11309, 11835, 15867, 26445, 32349, 33927, 53915, 56545, 79335, 97047, 101781, 161745, 169635, 463669, 485235, 508905, 1391007, 2318345, 4173021, 6955035, 20865105]

約数ペア:

[(1, 20865105), (3, 6955035), (5, 4173021), (9, 2318345), (15, 1391007), (41, 508905), (43, 485235), (45, 463669), (123, 169635), (129, 161745), (205, 101781), (215, 97047), (263, 79335), (369, 56545), (387, 53915), (615, 33927), (645, 32349), (789, 26445), (1315, 15867), (1763, 11835), (1845, 11309), (1935, 10783), (2367, 8815), (3945, 5289)]