How many angels oversee hell?

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Nineteen

Ah, what will convey unto thee what that burning is! -

It leaveth naught; it spareth naught

It shrivelleth the man.

Above it are nineteen. Quran 74:27-31

This number (19) is a stumbling block to disbelievers.

Their number have We [Allah] made to be a stumbling-block for those who disbelieve. Quran 74:31