20528417

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{383}}^1$

素因数の和:453

約数の個数: 32

約数和(自身を含む): 27525120

約数和(自身を除く): 6996703

約数列:

[1, 7, 13, 19, 31, 91, 133, 217, 247, 383, 403, 589, 1729, 2681, 2821, 4123, 4979, 7277, 7657, 11873, 34853, 50939, 53599, 83111, 94601, 154349, 225587, 662207, 1080443, 1579109, 2932631, 20528417]

約数ペア:

[(1, 20528417), (7, 2932631), (13, 1579109), (19, 1080443), (31, 662207), (91, 225587), (133, 154349), (217, 94601), (247, 83111), (383, 53599), (403, 50939), (589, 34853), (1729, 11873), (2681, 7657), (2821, 7277), (4123, 4979)]