The answer depends on the extent to which the number is rounded.
17 is estimated to 20.
20
The estimated cost of damage is $20-25 billion.
20
It is an estimated 20 miles between the Miami Airport and the port of Miami. The estimated drive time is 20 to 25 minutes.
20%
$20 Million USD
One week has 7 days. So 1 day is 1/7 weeks. Therefore 20 days=20/7 =3.86 weeks(estimated, actual value contains infinite decimal places).
Estimated around 20 million
20 x 8 = 160
18 - 20 inch estimated
20 is a pretty good estimate.