20212280

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{647}}^1$

素因数の和:740

約数の個数: 64

約数和(自身を含む): 50388480

約数和(自身を除く): 30176200

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 71, 88, 110, 142, 220, 284, 355, 440, 568, 647, 710, 781, 1294, 1420, 1562, 2588, 2840, 3124, 3235, 3905, 5176, 6248, 6470, 7117, 7810, 12940, 14234, 15620, 25880, 28468, 31240, 35585, 45937, 56936, 71170, 91874, 142340, 183748, 229685, 284680, 367496, 459370, 505307, 918740, 1010614, 1837480, 2021228, 2526535, 4042456, 5053070, 10106140, 20212280]

約数ペア:

[(1, 20212280), (2, 10106140), (4, 5053070), (5, 4042456), (8, 2526535), (10, 2021228), (11, 1837480), (20, 1010614), (22, 918740), (40, 505307), (44, 459370), (55, 367496), (71, 284680), (88, 229685), (110, 183748), (142, 142340), (220, 91874), (284, 71170), (355, 56936), (440, 45937), (568, 35585), (647, 31240), (710, 28468), (781, 25880), (1294, 15620), (1420, 14234), (1562, 12940), (2588, 7810), (2840, 7117), (3124, 6470), (3235, 6248), (3905, 5176)]