Let $k<<n$ denote that $k<n$ and $k\mid n$. Let $f:\{1,2,...,2013\}\rightarrow \{1,2,...,M\}$ be such that, if $n\leq 2013$ and $k<<n$, then $f(k)<<f(n)$. What’s the least possible value of $M$?
1. **Understanding the Problem:**
   We are given a function \( f: \{1, 2, \ldots, 2013\} \rightarrow \{1, 2, \ldots, M\} \) such that if \( k << n \) (meaning \( k < n \) and \( k \mid n \)), then \( f(k) << f(n) \) (meaning \( f(k) < f(n) \) and \( f(k) \mid f(n) \)). We need to find the least possible value of \( M \).

2. **Analyzing the Function:**
   Consider the sequence of powers of 2 up to 2013:
   \[
   1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024
   \]
   For these values, we have:
   \[
   f(1) << f(2) << f(4) << \cdots << f(1024)
   \]
   This implies:
   \[
   f(1) < f(2) < f(4) < \cdots < f(1024)
   \]
   and each \( f(k) \) divides the next \( f(n) \).

3. **Establishing a Lower Bound for \( M \):**
   Since \( f(1) \mid f(2) \mid f(4) \mid \cdots \mid f(1024) \), we can infer:
   \[
   f(1024) \geq 2 f(512) \geq 4 f(256) \geq \cdots \geq 1024 f(1) \geq 1024
   \]
   Therefore, \( f(1024) \geq 1024 \), which implies \( M \geq 1024 \).

4. **Constructing a Function to Achieve \( M = 1024 \):**
   We can define \( f(n) \) in terms of the canonical factorization of \( n \). Let \( n = p_1^{a_1} p_2^{a_2} \cdots p_t^{a_t} \), where \( p_i \) are prime numbers and \( a_i \) are their respective exponents. Define:
   \[
   f(n) = 2^{a_1 + a_2 + \cdots + a_t}
   \]
   This ensures that if \( k \mid n \), then \( f(k) \mid f(n) \) and \( f(k) < f(n) \).

5. **Verification:**
   For any \( n \leq 2013 \), the maximum value of \( f(n) \) occurs when \( n \) is a product of the smallest primes with the highest exponents that do not exceed 2013. The highest power of 2 within this range is \( 1024 \), confirming that \( M = 1024 \) is achievable.

The final answer is \( \boxed{1024} \).