21781389

素因数分解:

$3^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{8167}}^1$

素因数の和:8304

約数の個数: 16

約数和(自身を含む): 33456128

約数和(自身を除く): 11674739

約数列:

[1, 3, 7, 21, 127, 381, 889, 2667, 8167, 24501, 57169, 171507, 1037209, 3111627, 7260463, 21781389]

約数ペア:

[(1, 21781389), (3, 7260463), (7, 3111627), (21, 1037209), (127, 171507), (381, 57169), (889, 24501), (2667, 8167)]