21164240

素因数分解:

$2^4\times 5^1\times {\mathrm{264553}}^1$

素因数の和:264566

約数の個数: 20

約数和(自身を含む): 49207044

約数和(自身を除く): 28042804

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264553, 529106, 1058212, 1322765, 2116424, 2645530, 4232848, 5291060, 10582120, 21164240]

約数ペア:

[(1, 21164240), (2, 10582120), (4, 5291060), (5, 4232848), (8, 2645530), (10, 2116424), (16, 1322765), (20, 1058212), (40, 529106), (80, 264553)]