Question 20
For positive integers $a,b$, define $a\blacksquare b=a\times1+a\times2+\cdots+a\times b$. For example, $3\blacksquare2=3\times1+3\times2=9$ and $2\blacksquare3=2\times1+2\times2+2\times3=12$. Positive integers $m,n$ satisfy $m\blacksquare2021=2022\blacksquare n$. Find the smallest value of $m+n$.