the order of running code in a decorator function

[akbarza]

hi
in below code:

# from:https://python.coderz.ir/lessons/l14-recursive-  \
# functions-and-memoization-in-python.html 

def logger(func):
     print('Decorator is created!')
     def func_wrapper(number):
         print(f'New factorial call with parameter: {number}')
         result = func(number)
         print (f'factorial({number}) ==> {result}')
         return result
     return func_wrapper

@logger
def factorial(n):
    if n <= 1:
         return 1
    else:
         return n            #* factorial(n - 1)

def test():
     print("it is a test")

if __name__=="__main__" :
    test() 
    print(f"factoril(5) is : {factorial(5)}")

I ran and debugged the above code in idle.
the order of running lines was: 4,13,14,13,5,6,11,14,20,23,24,21,25,7,8,15,18,9,10 .
the above code is a decorator function. why the order of running lines is as above line? plz, explain.
thanks