21130640

素因数分解:

$2^4\times 5^1\times {\mathrm{264133}}^1$

素因数の和:264146

約数の個数: 20

約数和(自身を含む): 49128924

約数和(自身を除く): 27998284

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264133, 528266, 1056532, 1320665, 2113064, 2641330, 4226128, 5282660, 10565320, 21130640]

約数ペア:

[(1, 21130640), (2, 10565320), (4, 5282660), (5, 4226128), (8, 2641330), (10, 2113064), (16, 1320665), (20, 1056532), (40, 528266), (80, 264133)]