21048255

素因数分解:

$3^4\times 5^1\times {\mathrm{51971}}^1$

素因数の和:51988

約数の個数: 20

約数和(自身を含む): 37731672

約数和(自身を除く): 16683417

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51971, 155913, 259855, 467739, 779565, 1403217, 2338695, 4209651, 7016085, 21048255]

約数ペア:

[(1, 21048255), (3, 7016085), (5, 4209651), (9, 2338695), (15, 1403217), (27, 779565), (45, 467739), (81, 259855), (135, 155913), (405, 51971)]