A rich aunt has promised you $4,000 one year from today. In addition, each year after that, she has promised you a payment (on the anniversary of the last payment) that is 2% larger than the last payment. She will continue to show this generosity for 20 years, giving a total of 20 payments. If the interest rate is 9%, what is her promise worth today? The present value of the aunt's promise is $ . (Round to the nearest dollar.)