19971991

素因数分解:

${\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{90371}}^1$

素因数の和:90401

約数の個数: 8

約数和(自身を含む): 22773744

約数和(自身を除く): 2801753

約数列:

[1, 13, 17, 221, 90371, 1174823, 1536307, 19971991]

約数ペア:

[(1, 19971991), (13, 1536307), (17, 1174823), (221, 90371)]