Resolved questions
what is the difference between 번호 and 숫자?

They are not interchangeable.

번호 is used to mark items or list things.
ex) 1번 후보 candidate number one
ex) 1번 문 Gate 1
ex) 101번 방 Room 101

숫자 is a general term for a number. 숫자 can be big or small, and can be calculated. Similar to a figure.
ex) 숫자가 크다/작다 The number is big/small.
ex) 여러 숫자들이 많다 There are many different numbers.
ex) 숫자 계산 calculation of numbers

수치 is a resulting number after measurement or calculation.
ex) 혈압수치 blood pressure