CREATE TABLE table_20939 ("Number" FLOAT, "Name" TEXT, "Kilometer" FLOAT, "Pavement" TEXT, "Length  ( m ) " FLOAT, "Average climb  ( % ) " FLOAT)

How many have a kilometers of 233?
SELECT "Number" FROM table_20939 WHERE "Kilometer" = '233'
SELECT "Number" FROM "table_20939" WHERE "Kilometer" = '233'