if your input is 12v, and output is 24v, 20A...then your peak input current in the inductor could be as low as 45A or so.
ILL SEND YOU BOOST SIM AND YOU CAN GET INTO IT. (sorry about capitals)
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here, not your spec but youll get into it. iTS FRee ltspice sim
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ALSO HERE IT IS A BASIC ONE FOR YOUR SPEC......just so you can get your head into it, not the finished design as you are cognisant.
you just convert the .txt to .asc , open it in ltspice and hit the running man icon