21130431

素因数分解:

$3^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{7681}}^1$

素因数の和:7822

約数の個数: 16

約数和(自身を含む): 32448768

約数和(自身を除く): 11318337

約数列:

[1, 3, 7, 21, 131, 393, 917, 2751, 7681, 23043, 53767, 161301, 1006211, 3018633, 7043477, 21130431]

約数ペア:

[(1, 21130431), (3, 7043477), (7, 3018633), (21, 1006211), (131, 161301), (393, 53767), (917, 23043), (2751, 7681)]