20640891

素因数分解:

$3^1\times {\mathrm{67}}^1\times {\mathrm{103}}^1\times {\mathrm{997}}^1$

素因数の和:1170

約数の個数: 16

約数和(自身を含む): 28231424

約数和(自身を除く): 7590533

約数列:

[1, 3, 67, 103, 201, 309, 997, 2991, 6901, 20703, 66799, 102691, 200397, 308073, 6880297, 20640891]

約数ペア:

[(1, 20640891), (3, 6880297), (67, 308073), (103, 200397), (201, 102691), (309, 66799), (997, 20703), (2991, 6901)]