Count in Spanish to 20 with this quick 5 minute Spanish lesson. Counting in Spanish to 20 is easy - just follow along with this free Spanish lesson, and repeat as many times as needed until you pass the Spanish numbers quiz. Learning numbers in Spanish is made easy with Language of Earth! Language of Earth provides language-learning videos, like these 5 minute Spanish lessons. Subscribe today! null When counting in Spanish to 20, only one number has an accent mark: 16 dieciséis. Below are the numbers spelled out, for help writing numbers in Spanish to 20. Spanish Numbers 1-20: 1 uno 2 dos 3 tres 4 cuatro 5 cinco 6 seis 7 siete 8 ocho 9 nueve 10 diez 11 once 12 doce 13 trece 14 catorce 15 quince 16 dieciséis 17 diecisiete 18 dieciocho 19 diecinueve 20 veinte