Find out how many positive integers $n$ not larger than $2009$ exist such that the last digit of $n^{20}$ is $1$.
To solve the problem, we need to find the number of positive integers \( n \) not larger than \( 2009 \) such that the last digit of \( n^{20} \) is \( 1 \). 

1. **Understanding the condition \( n^{20} \equiv 1 \pmod{10} \):**
   - For \( n^{20} \equiv 1 \pmod{10} \), \( n \) must be coprime to \( 10 \) (i.e., \( \gcd(n, 10) = 1 \)).
   - The integers coprime to \( 10 \) are those that do not end in \( 0, 2, 4, 5, 6, \) or \( 8 \). Therefore, the possible last digits of \( n \) are \( 1, 3, 7, \) and \( 9 \).

2. **Counting the numbers coprime to \( 10 \) up to \( 2009 \):**
   - We need to count the numbers from \( 1 \) to \( 2009 \) that end in \( 1, 3, 7, \) or \( 9 \).
   - There are \( 4 \) such numbers in every \( 10 \) consecutive integers (e.g., \( 1, 3, 7, 9 \) in \( 1-10 \), \( 11, 13, 17, 19 \) in \( 11-20 \), etc.).

3. **Calculating the total count:**
   - The total number of integers from \( 1 \) to \( 2009 \) is \( 2009 \).
   - Since there are \( 4 \) numbers ending in \( 1, 3, 7, \) or \( 9 \) in every \( 10 \) integers, we can use the formula:
     \[
     \text{Total count} = \left\lfloor \frac{2009}{10} \right\rfloor \times 4 + \text{extra numbers}
     \]
   - First, calculate the number of complete sets of \( 10 \) within \( 2009 \):
     \[
     \left\lfloor \frac{2009}{10} \right\rfloor = 200
     \]
   - Therefore, the number of integers ending in \( 1, 3, 7, \) or \( 9 \) in these complete sets is:
     \[
     200 \times 4 = 800
     \]
   - Now, consider the remaining numbers from \( 2001 \) to \( 2009 \):
     - The numbers in this range are \( 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 \).
     - Among these, the numbers ending in \( 1, 3, 7, \) or \( 9 \) are \( 2001, 2003, 2007, \) and \( 2009 \), which are \( 4 \) numbers.

4. **Adding the counts:**
   - Total count of numbers ending in \( 1, 3, 7, \) or \( 9 \) up to \( 2009 \) is:
     \[
     800 + 4 = 804
     \]

Conclusion:
\[
\boxed{804}
\]