Just to clear up, @DrAzzy is right about the 36kB of RAM - but within each 20 byte storage unit there is a 4 byte overhead, so the maximum actual data you could store is just shy of 1800*16 = 28800 bytes.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Just to clear up, @DrAzzy is right about the 36kB of RAM - but within each 20 byte storage unit there is a 4 byte overhead, so the maximum actual data you could store is just shy of 1800*16 = 28800 bytes.