21217720

素因数分解:

$2^3\times 5^1\times {\mathrm{530443}}^1$

素因数の和:530454

約数の個数: 16

約数和(自身を含む): 47739960

約数和(自身を除く): 26522240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 530443, 1060886, 2121772, 2652215, 4243544, 5304430, 10608860, 21217720]

約数ペア:

[(1, 21217720), (2, 10608860), (4, 5304430), (5, 4243544), (8, 2652215), (10, 2121772), (20, 1060886), (40, 530443)]