Amount, when used as a noun, describes a quantity of uncountable nouns, such as air, water, or time.
When used as a noun, numbersignifies a quantity of countable nouns, such as trees, cities, or papers.
When is amount used?
Amount, when used as a noun, For instance,
We did not have sufficient amount of time to visit the park.
As a verb, amount is used with to (amount to); it describes an accumulation of something.
For instance, My bill amounted to $400.
When is number used?
When used as a noun, For instance,
I have to review a number of research papers today.Number is also used as a verb when you want to give a serial number to something or to count something that is typically large in numbers.
All the seats in the classroom are numbered.