21055760

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{337}}^1$

素因数の和:432

約数の個数: 80

約数和(自身を含む): 54317952

約数和(自身を除く): 33262192

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 71, 80, 88, 110, 142, 176, 220, 284, 337, 355, 440, 568, 674, 710, 781, 880, 1136, 1348, 1420, 1562, 1685, 2696, 2840, 3124, 3370, 3707, 3905, 5392, 5680, 6248, 6740, 7414, 7810, 12496, 13480, 14828, 15620, 18535, 23927, 26960, 29656, 31240, 37070, 47854, 59312, 62480, 74140, 95708, 119635, 148280, 191416, 239270, 263197, 296560, 382832, 478540, 526394, 957080, 1052788, 1315985, 1914160, 2105576, 2631970, 4211152, 5263940, 10527880, 21055760]

約数ペア:

[(1, 21055760), (2, 10527880), (4, 5263940), (5, 4211152), (8, 2631970), (10, 2105576), (11, 1914160), (16, 1315985), (20, 1052788), (22, 957080), (40, 526394), (44, 478540), (55, 382832), (71, 296560), (80, 263197), (88, 239270), (110, 191416), (142, 148280), (176, 119635), (220, 95708), (284, 74140), (337, 62480), (355, 59312), (440, 47854), (568, 37070), (674, 31240), (710, 29656), (781, 26960), (880, 23927), (1136, 18535), (1348, 15620), (1420, 14828), (1562, 13480), (1685, 12496), (2696, 7810), (2840, 7414), (3124, 6740), (3370, 6248), (3707, 5680), (3905, 5392)]