The exchange rate between Amazon gift cards and the Nigerian Naira can vary depending on various factors. To determine how much 20 Amazon gift cards are worth in Naira today, one needs to consider the current market rates.

Typically, the value is influenced by economic conditions, supply and demand dynamics in the gift card resale market, and currency fluctuations. There are different platforms and channels through which these conversions might occur. Some individuals or entities deal in the exchange of such gift cards for local currency.

However, it's important to note that the exchange rate is not static. It can change throughout the day. To get the most accurate figure for how much 20 Amazon gift cards are equivalent to in Naira today, it would be advisable to check with reliable currency exchange platforms or those specifically dealing with gift card conversions. This ensures that one gets a fair and up-to-date value for their Amazon gift cards when converting them to the Nigerian Naira.