21347145

素因数分解:

$3^4\times 5^1\times {\mathrm{52709}}^1$

素因数の和:52726

約数の個数: 20

約数和(自身を含む): 38267460

約数和(自身を除く): 16920315

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 52709, 158127, 263545, 474381, 790635, 1423143, 2371905, 4269429, 7115715, 21347145]

約数ペア:

[(1, 21347145), (3, 7115715), (5, 4269429), (9, 2371905), (15, 1423143), (27, 790635), (45, 474381), (81, 263545), (135, 158127), (405, 52709)]