The process of converting an Amazon card worth $20 to Nigerian Naira involves several steps. Firstly, one needs to determine the current exchange rate between the US dollar and the Nigerian Naira. This rate can fluctuate daily based on various economic factors.

Once the exchange rate is known, multiplying the $20 amount on the Amazon card by the exchange rate will yield the equivalent value in Naira. For example, if the exchange rate is 1 US dollar = 410 Nigerian Naira, then $20 would be 20 * 410 = 8200 Naira.
However, it's important to note that when converting, there may be some fees associated with the conversion process. These fees can vary depending on the method used for conversion. Some financial institutions or online platforms might charge a percentage of the total amount being converted. So, it's crucial to consider these additional costs to accurately calculate the final amount of Naira one will receive from the $20 Amazon card conversion.