19997971

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{223}}^1\times {\mathrm{557}}^1$

素因数の和:810

約数の個数: 16

約数和(自身を含む): 23998464

約数和(自身を除く): 4000493

約数列:

[1, 7, 23, 161, 223, 557, 1561, 3899, 5129, 12811, 35903, 89677, 124211, 869477, 2856853, 19997971]

約数ペア:

[(1, 19997971), (7, 2856853), (23, 869477), (161, 124211), (223, 89677), (557, 35903), (1561, 12811), (3899, 5129)]