21007959

素因数分解:

$3^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{7877}}^1$

素因数の和:8014

約数の個数: 16

約数和(自身を含む): 32268288

約数和(自身を除く): 11260329

約数列:

[1, 3, 7, 21, 127, 381, 889, 2667, 7877, 23631, 55139, 165417, 1000379, 3001137, 7002653, 21007959]

約数ペア:

[(1, 21007959), (3, 7002653), (7, 3001137), (21, 1000379), (127, 165417), (381, 55139), (889, 23631), (2667, 7877)]