A positive integer $N$ is [i]interoceanic[/i] if its prime factorization 

$$N=p_1^{x_1}p_2^{x_2}\cdots p_k^{x_k}$$

satisfies 

$$x_1+x_2+\dots +x_k=p_1+p_2+\cdots +p_k.$$

Find all interoceanic numbers less than 2020.
1. **Prove that \( k \leq 3 \):**
   - If there are at least 4 prime numbers, we have \( p_1 + p_2 + p_3 + p_4 \geq 2 + 3 + 5 + 7 = 17 \).
   - Since \( x_1 + x_2 + x_3 + x_4 = p_1 + p_2 + p_3 + p_4 \geq 17 \), it follows that \( N > 2^{x_1} \cdot 2^{x_2} \cdot 2^{x_3} \cdot 2^{x_4} = 2^{x_1 + x_2 + x_3 + x_4} = 2^{17} > 2020 \), which is a contradiction.
   - Therefore, \( k \leq 3 \).

2. **Case \( k = 3 \):**
   - Assume without loss of generality that \( p_1 < p_2 < p_3 \).
   - Then \( N = p_1^{x_1} \cdot p_2^{x_2} \cdot p_3^{x_3} > 2^{x_1} \cdot 2^{x_2} \cdot 4^{x_3} = 2^{x_1 + x_2 + 2x_3} = 2^{p_1 + p_2 + p_3 + x_3} \geq 2^{2 + 3 + 5 + x_3} = 2^{10 + x_3} \geq 2^{11} > 2020 \).
   - This is a contradiction, so there are no solutions for \( k = 3 \).

3. **Case \( k = 2 \):**
   - We have \( p_1 + p_2 = x_1 + x_2 \leq 10 \).
   - We are limited to using the prime numbers \( 2, 3, 5, 7 \).
   - We need to consider the pairs \( (2,3), (2,5), (2,7), (3,5), (3,7) \).

   - **Case 1: \( x_1 + x_2 = 2 + 3 = 5 \)**
     - The solutions are \( N = 3^4 \cdot 2, 3^3 \cdot 2^2, 3^2 \cdot 2^3, 3 \cdot 2^4 \).
     - Calculations:
       \[
       3^4 \cdot 2 = 81 \cdot 2 = 162
       \]
       \[
       3^3 \cdot 2^2 = 27 \cdot 4 = 108
       \]
       \[
       3^2 \cdot 2^3 = 9 \cdot 8 = 72
       \]
       \[
       3 \cdot 2^4 = 3 \cdot 16 = 48
       \]

   - **Case 2: \( x_1 + x_2 = 2 + 5 = 7 \)**
     - Since \( 5^4 \cdot 2^3 > 2020 \), the solutions for this case are \( N = 5^3 \cdot 2^4, 5^2 \cdot 2^5, 5 \cdot 2^6 \).
     - Calculations:
       \[
       5^3 \cdot 2^4 = 125 \cdot 16 = 2000
       \]
       \[
       5^2 \cdot 2^5 = 25 \cdot 32 = 800
       \]
       \[
       5 \cdot 2^6 = 5 \cdot 64 = 320
       \]

   - **Case 3: \( x_1 + x_2 = 2 + 7 = 9 \)**
     - The only solution is \( N = 2^8 \cdot 7 \).
     - Calculation:
       \[
       2^8 \cdot 7 = 256 \cdot 7 = 1792
       \]

   - **Case 4: \( x_1 + x_2 = 3 + 5 = 8 \)**
     - Since \( 3^7 \cdot 5 > 2020 \), there are no solutions in this case.

   - **Case 5: \( x_1 + x_2 = 3 + 7 = 10 \)**
     - Since \( 3^9 \cdot 7 > 2020 \), there are no solutions in this case.

4. **Case \( k = 1 \):**
   - We take \( N = 2^2, 3^3 \).
   - Calculations:
     \[
     2^2 = 4
     \]
     \[
     3^3 = 27
     \]

The interoceanic numbers less than 2020 are: \( 4, 27, 48, 72, 108, 162, 320, 800, 1792, 2000 \).

The final answer is \( \boxed{ \{4, 27, 48, 72, 108, 162, 320, 800, 1792, 2000\} } \).