20991008

素因数分解:

$2^5\times {\mathrm{71}}^1\times {\mathrm{9239}}^1$

素因数の和:9320

約数の個数: 24

約数和(自身を含む): 41912640

約数和(自身を除く): 20921632

約数列:

[1, 2, 4, 8, 16, 32, 71, 142, 284, 568, 1136, 2272, 9239, 18478, 36956, 73912, 147824, 295648, 655969, 1311938, 2623876, 5247752, 10495504, 20991008]

約数ペア:

[(1, 20991008), (2, 10495504), (4, 5247752), (8, 2623876), (16, 1311938), (32, 655969), (71, 295648), (142, 147824), (284, 73912), (568, 36956), (1136, 18478), (2272, 9239)]