The part number is CAP ALUM POLY 270UF 20 16V SMD. This refers to a type of aluminum-polymer capacitor with a capacitance of 270 microfarads, operating voltage of 16 volts, and packaged in surface mount (SMD) technology. It has a resistance value of 9 milliohms and is designed for use at temperatures up to 105°C with a lifespan of 2000 hours.