Please check your bill again and post a new, separate question including its date.
Also make sure that what you have is in fact a silver certificate; it should have those words somewhere on the front of the bill. $20 silver certificates were only issued from 1878 to 1891. Anything later would be a different type of bill with different wording.
Please don't assume that every old bill is a silver certificate. 1914 $20 bills were issued as Federal Reserve Notes, not silver certificates. There's more information at the question "What is the value of a 1914 US 20 dollar bill?".
these sell for $20-25 in online auctions
$20 to $60 depending on condition
Please don't assume that every old bill must be a silver certificate. The last US $20 silver certificates were printed in 1891. As the green seal and banner across the top of the bill indicate, a 1934 $20 bill is a Federal Reserve Note. There's more information at the question "What is the value of a 1934 US 20 dollar bill?" .
Please don't assume that because a bill is old it must be a silver certificate. The last US $20 silver certificates were printed in 1891. As you can see by the banner across the top of the bill and the green seal, your bill is a Federal Reserve Note. There's more information at the question "What is the value of a 1950 US 20 dollar bill?"
well-worn = $20 lightly worn = $40 crisp uncirculated = $60
The US only issued $1 silver certificates dated 1957. No other denominations have that date. The last $20 silver certificates were issued in the 1891 series.
Please don't assume that every old bill is a silver certificate. As the banner across its top and green seal color indicate, your bill is a Federal Reserve Note, the same kind issued today but with a different design. There's more information the at question "What is the value of a 1963 US 20 dollar bill?".
Please check your bill again and post a new question. The last US $20 silver certificates were printed in 1891, and no $20 bills of any kind were printed in 1953.
The last $20 silver certificates are dated 1891. There are no U.S. bills of any type dated 1955. Please check again and post a new question.
Please check your bill again and post a new, separate question. No US bills are dated 1937, and the last $20 silver certificates were printed in 1891.
As the banner across the top indicates, your bill is actually a Federal Reserve Note. Not all old bills are automatically silver certificates. Please see the question "What is the value of a 1934 US 20 dollar bill with HAWAII on it?" for more information.