21210399

素因数分解:

$3^2\times 7^1\times {\mathrm{197}}^1\times {\mathrm{1709}}^1$

素因数の和:1919

約数の個数: 24

約数和(自身を含む): 35212320

約数和(自身を除く): 14001921

約数列:

[1, 3, 7, 9, 21, 63, 197, 591, 1379, 1709, 1773, 4137, 5127, 11963, 12411, 15381, 35889, 107667, 336673, 1010019, 2356711, 3030057, 7070133, 21210399]

約数ペア:

[(1, 21210399), (3, 7070133), (7, 3030057), (9, 2356711), (21, 1010019), (63, 336673), (197, 107667), (591, 35889), (1379, 15381), (1709, 12411), (1773, 11963), (4137, 5127)]