Squarefree factorisations

Consider the number $420$

It can be decomposed in product of 2 squarefree factors in 4 different ways:
$2\times 210$
$6\times 70$
$10\times 42$
$14\times 30$

Let $d(n)=\text{ number of pairs }(x,y)\text{ such as x,y squarefree, }x\times y=n\text{ and }x\le y$


Find ${\displaystyle \sum _{k=1}^{20,000,000}d(k)}$

[My timing: 45 sec]