20721449

素因数分解:

$7^1\times {\mathrm{59}}^1\times {\mathrm{131}}^1\times {\mathrm{383}}^1$

素因数の和:580

約数の個数: 16

約数和(自身を含む): 24330240

約数和(自身を除く): 3608791

約数列:

[1, 7, 59, 131, 383, 413, 917, 2681, 7729, 22597, 50173, 54103, 158179, 351211, 2960207, 20721449]

約数ペア:

[(1, 20721449), (7, 2960207), (59, 351211), (131, 158179), (383, 54103), (413, 50173), (917, 22597), (2681, 7729)]