Option 1. Open an account t with Capital One and put it all in their high yield savings account. Interest rate will fluctuate based on the Fed rate but it’s far better than a standard savings. Never look at it again.
Option 2. Open a Fidelity brokerage and put it all in SPAXX. Like the HYSA, but with ever so slightly better interest. Never look at it again.
Option 3. Open a Fidelity brokerage and buy VOO. Set dividend reinvestment and never look at it again.
Option 4. Open Fidelity Roth IRA and put max amount in every year until all 20K is in there. But VOO, set dividend reinvestment and never look at it again. Won’t pay taxes on it when you take it out at retirement age.
Option 5. Open Fidelity brokerage and use it to buy TBills. They are easy, safe and no state income taxes, if applicable. Short, mid or long term options. Long term option you could forget about it.
If you need help with any of the options, I can walk you through it.
Edit to add. Just saw this in an emergency fund. In that case, SPAXX, HYSA or short term TBills is the only thing I would do with it.