21249945

素因数分解:

$3^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{739}}^1$

素因数の和:827

約数の個数: 40

約数和(自身を含む): 38681280

約数和(自身を除く): 17431335

約数列:

[1, 3, 5, 9, 15, 27, 45, 71, 81, 135, 213, 355, 405, 639, 739, 1065, 1917, 2217, 3195, 3695, 5751, 6651, 9585, 11085, 19953, 28755, 33255, 52469, 59859, 99765, 157407, 262345, 299295, 472221, 787035, 1416663, 2361105, 4249989, 7083315, 21249945]

約数ペア:

[(1, 21249945), (3, 7083315), (5, 4249989), (9, 2361105), (15, 1416663), (27, 787035), (45, 472221), (71, 299295), (81, 262345), (135, 157407), (213, 99765), (355, 59859), (405, 52469), (639, 33255), (739, 28755), (1065, 19953), (1917, 11085), (2217, 9585), (3195, 6651), (3695, 5751)]