Resolving this error msg: #VALUE!

[zyzzyva57]

I have a column that is a series of calculations
Occasionally, one of the cells a calculation is based upon has text data inserted, because no data exist for that cell, say, E20/F20,
F20 has text indicating no numerical data is available

If this occurs, how can I make my formula to indicate something other than #VALUE!
I am not concerned with what is put into the cell, only removing the error

Thank you

[Phuocam]

Try this ...
=IFERROR(E20/F20,"")

[FDibbins]

Or...
=if(isnumber(F20),E20/F20,"")

[zyzzyva57]

=if(isnumber(F20),E20/F20,"")
seems to work best for what I want

Thank you both