21215985

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1$

素因数の和:222

約数の個数: 64

約数和(自身を含む): 41091072

約数和(自身を除く): 19875087

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 43, 105, 111, 127, 129, 185, 215, 259, 301, 381, 555, 635, 645, 777, 889, 903, 1295, 1505, 1591, 1905, 2667, 3885, 4445, 4515, 4699, 4773, 5461, 7955, 11137, 13335, 14097, 16383, 23495, 23865, 27305, 32893, 33411, 38227, 55685, 70485, 81915, 98679, 114681, 164465, 167055, 191135, 202057, 493395, 573405, 606171, 1010285, 1414399, 3030855, 4243197, 7071995, 21215985]

約数ペア:

[(1, 21215985), (3, 7071995), (5, 4243197), (7, 3030855), (15, 1414399), (21, 1010285), (35, 606171), (37, 573405), (43, 493395), (105, 202057), (111, 191135), (127, 167055), (129, 164465), (185, 114681), (215, 98679), (259, 81915), (301, 70485), (381, 55685), (555, 38227), (635, 33411), (645, 32893), (777, 27305), (889, 23865), (903, 23495), (1295, 16383), (1505, 14097), (1591, 13335), (1905, 11137), (2667, 7955), (3885, 5461), (4445, 4773), (4515, 4699)]