How many books you can load in a device with16 GB?

It can very dramatically depending on the file size, and that varies by format. a 300 page novel can fit in as little as 250kb. There are 1024 kb in each mb, and 1024 mb in each gb. Therefore, there are 16777216 kb in your device. Find three different ebooks, and look at the file size, then do the following math:
16777216/([file size one+file size two+file size three]/3)