20971489

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{433}}^1$

素因数の和:505

約数の個数: 32

約数和(自身を含む): 28498176

約数和(自身を除く): 7526687

約数列:

[1, 7, 11, 17, 37, 77, 119, 187, 259, 407, 433, 629, 1309, 2849, 3031, 4403, 4763, 6919, 7361, 16021, 33341, 48433, 51527, 80971, 112147, 176231, 272357, 566797, 1233617, 1906499, 2995927, 20971489]

約数ペア:

[(1, 20971489), (7, 2995927), (11, 1906499), (17, 1233617), (37, 566797), (77, 272357), (119, 176231), (187, 112147), (259, 80971), (407, 51527), (433, 48433), (629, 33341), (1309, 16021), (2849, 7361), (3031, 6919), (4403, 4763)]