21307489

素因数分解:

$7^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{2441}}^1$

素因数の和:2520

約数の個数: 16

約数和(自身を含む): 25787520

約数和(自身を除く): 4480031

約数列:

[1, 7, 29, 43, 203, 301, 1247, 2441, 8729, 17087, 70789, 104963, 495523, 734741, 3043927, 21307489]

約数ペア:

[(1, 21307489), (7, 3043927), (29, 734741), (43, 495523), (203, 104963), (301, 70789), (1247, 17087), (2441, 8729)]