hi Brandon. What is it with the 20k cash. Can you have someone waiting to meet you in the airport with the cash. Seems an unusual request that people carry that amount of cash on them , especially when we have other options for paying too.
it is the immigration who will refuse your entry, then , the airline, whom brought you, is responsible for your return. Hence why they should check , if you have a single ticket, so they dont have to repatriate you.