81991

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1$

素因数の和:90

約数の個数: 16

約数和(自身を含む): 108864

約数和(自身を除く): 26873

約数列:

[1, 7, 13, 17, 53, 91, 119, 221, 371, 689, 901, 1547, 4823, 6307, 11713, 81991]

約数ペア:

[(1, 81991), (7, 11713), (13, 6307), (17, 4823), (53, 1547), (91, 901), (119, 689), (221, 371)]