Insurance lump sum investment.

I'm due to receive my endowment insurance policy maturity lump sum which will be paid direct to me before I pass it over to my mortgage provider.
It's about 20k so I want to try and earn a bit of money from it first.
I'm thinking that I may be able to open an account that offers a cash back incentive or short term interest to deposit the money into.
Any ideas please?
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