Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_20890 ( "Archbishop" text, "Born" text, "Ordained Priest" text, "Ordained Bishop" text, "Appointed Archbishop" text, "Vacated throne" text, "Died" text )

### Question ###
How many appointed archbishops were ordained as priests on December 20, 1959

### Accurate SQL ###

SELECT COUNT("Appointed Archbishop") FROM table_20890 WHERE "Ordained Priest" = 'December 20, 1959'