EXCEL itself has no such function. It can be realized by customizing a function through VBA programming, which requires a certain foundation. I suggest Baidu take a look at VBA tutorial.

I used the following automatic functions to realize the requirements of the post. My program code is as follows (the code is in the module):

After entering the above program, you can calculate in the table. Here is an example of my calculation of 10 and 20:

The program text code is as follows:

Option explicit

Function User-defined function 1(n) is Double.

Size r#, i%

if VarType(n)& lt； & gt vbDouble then.

Custom function1= "parameter"&; N & "Not an integer!"

other

r = 1

For i = 2 to n-1

If n Mod i = 0, then

If the prime number judges (i), then r = r * (1- 1/i).

If ... it will be over.

Next, I

Custom function 1 = r

If ... it will be over.

End function

The function prime number judgment (n) is Boolean.

Dimension i%

Prime number judgment = false

For i = 2 to n-1

If n Mod i = 0, the function is exited.

Next, I

Prime number judgment = true

End function