20640057

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{101}}^1\times {\mathrm{4007}}^1$

素因数の和:4128

約数の個数: 16

約数和(自身を含む): 29434752

約数和(自身を除く): 8794695

約数列:

[1, 3, 17, 51, 101, 303, 1717, 4007, 5151, 12021, 68119, 204357, 404707, 1214121, 6880019, 20640057]

約数ペア:

[(1, 20640057), (3, 6880019), (17, 1214121), (51, 404707), (101, 204357), (303, 68119), (1717, 12021), (4007, 5151)]