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"Una" is a form of "una", a noun which is often translated as "one". "Veinte" is an adjective which is often translated as "twenty". Learn more about the difference between "una" and "veinte" below.
la una()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (time)
veinte()
An adjective is a word that describes a noun (e.g., the big dog).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (number)
b. twentieth (in dates)
El veinte del mes que viene me voy a España.I'm going to Spain on the twentieth of next month.
