21357105

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^2\times {\mathrm{41}}^2$

素因数の和:119

約数の個数: 72

約数和(自身を含む): 43998528

約数和(自身を除く): 22641423

約数列:

[1, 3, 5, 7, 11, 15, 21, 33, 35, 41, 55, 77, 105, 121, 123, 165, 205, 231, 287, 363, 385, 451, 605, 615, 847, 861, 1155, 1353, 1435, 1681, 1815, 2255, 2541, 3157, 4235, 4305, 4961, 5043, 6765, 8405, 9471, 11767, 12705, 14883, 15785, 18491, 24805, 25215, 34727, 35301, 47355, 55473, 58835, 74415, 92455, 104181, 129437, 173635, 176505, 203401, 277365, 388311, 520905, 610203, 647185, 1017005, 1423807, 1941555, 3051015, 4271421, 7119035, 21357105]

約数ペア:

[(1, 21357105), (3, 7119035), (5, 4271421), (7, 3051015), (11, 1941555), (15, 1423807), (21, 1017005), (33, 647185), (35, 610203), (41, 520905), (55, 388311), (77, 277365), (105, 203401), (121, 176505), (123, 173635), (165, 129437), (205, 104181), (231, 92455), (287, 74415), (363, 58835), (385, 55473), (451, 47355), (605, 35301), (615, 34727), (847, 25215), (861, 24805), (1155, 18491), (1353, 15785), (1435, 14883), (1681, 12705), (1815, 11767), (2255, 9471), (2541, 8405), (3157, 6765), (4235, 5043), (4305, 4961)]