Another option is to use a couple TPIC6B595 shift registers to pull the cathodes low. High current, can handle 160mA from 8 LEDs on at once.
Available in DIP package, easy to breadboard with.
If you decide to make a big display, say 3 LEDs in series with 12V source for each segment, can drive that too.
Or just connect the 14 cathodes to 14 output pins (you have 20) with appropriate current limit resistor on each pin:
(5V - Vf)/.02A = Resistor
Vf usually ~2V, so (5V-2V)/.02A = 150 ohm.
Confirm the voltage drop across the LEDS you plan to use.