21265520

素因数分解:

$2^4\times 5^1\times {\mathrm{265819}}^1$

素因数の和:265832

約数の個数: 20

約数和(自身を含む): 49442520

約数和(自身を除く): 28177000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 265819, 531638, 1063276, 1329095, 2126552, 2658190, 4253104, 5316380, 10632760, 21265520]

約数ペア:

[(1, 21265520), (2, 10632760), (4, 5316380), (5, 4253104), (8, 2658190), (10, 2126552), (16, 1329095), (20, 1063276), (40, 531638), (80, 265819)]