KöMaL 2025 B5450

Let positive integer $d$ be called a block-divisor of positive integer $n$ if $d\mid n$ and moreover, $d$ and $\frac{n}{d}$ are coprimes. Let $B(n)$ denote the sum of the block-divisors of $n$. Find all positive integers $n$ such that $n$ has at most three distinct prime factors and $B(n)=2n$.