How can I find this?

[twilit bear]

Apologies to all math peeps 🙏

[finite dove]

I would probably start with $u = \sqrt{x}$ so basically [ 4 \cdot \int \frac{u^3}{1-u^3} : \dd u ]

[livid falcon]

bacc (unhelpful)

[olive carbon]

It has a singularity at x=1 of type 1/(x-1), so strictly speaking it is a divergent improper integral. Unless you need a Cauchy principal value.

[twilit bear]

so it can’t be evaluated any further?

[olive carbon]

As it is reduced to rational function you can find an expression for the indefinite integral.

but if you want to use those limits 0, 20 you need first to ask yourself what entity you need to compute.