21191571

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{337}}^1$

素因数の和:500

約数の個数: 32

約数和(自身を含む): 33583680

約数和(自身を除く): 12392109

約数列:

[1, 3, 9, 17, 27, 51, 137, 153, 337, 411, 459, 1011, 1233, 2329, 3033, 3699, 5729, 6987, 9099, 17187, 20961, 46169, 51561, 62883, 138507, 154683, 415521, 784873, 1246563, 2354619, 7063857, 21191571]

約数ペア:

[(1, 21191571), (3, 7063857), (9, 2354619), (17, 1246563), (27, 784873), (51, 415521), (137, 154683), (153, 138507), (337, 62883), (411, 51561), (459, 46169), (1011, 20961), (1233, 17187), (2329, 9099), (3033, 6987), (3699, 5729)]