21881797

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{523}}^1$

素因数の和:712

約数の個数: 16

約数和(自身を含む): 25822720

約数和(自身を除く): 3940923

約数列:

[1, 7, 43, 139, 301, 523, 973, 3661, 5977, 22489, 41839, 72697, 157423, 508879, 3125971, 21881797]

約数ペア:

[(1, 21881797), (7, 3125971), (43, 508879), (139, 157423), (301, 72697), (523, 41839), (973, 22489), (3661, 5977)]