Gov. Andrew Cuomo on Thursday offered Michael Bloomberg a piece of advice after the former New York mayor’s brutal 2020 debate debut: Throw more money at it.

“Break out another hundred million,” cracked Cuomo when asked at an unrelated Midtown press briefing to evaluate the performance of his “old pal” in Wednesday night’s Las Vegas debate.

“He’s done very well with the advertising. … The amount of funding a person has is a major factor,” said Cuomo of the billionaire Bloomberg, the only candidate bankrolling his own campaign.

Bloomberg, appearing in his first debate of the election cycle, was pummeled by attacks on his wealth, reliance on stop-and-frisk policing as mayor and liberal use of nondisclosure agreements with employees at his business-news company.

“I think he needs better answers than he gave last night,” said Cuomo. “I don’t think it’s rust. It’s the substance he has a problem with.

“They were questioning substance, not style.”

Mayor Bill de Blasio also panned his predecessor’s performance Thursday.

“I think he came across as an arrogant billionaire, which I think is accurate,” said de Blasio, speaking at an unrelated Brooklyn event. “I was astounded, as someone who has done a lot of debate prep in my life, [that] he made no attempt whatsoever to mask a worldview — not just a personality — a worldview that I think is really troubling to a lot of working people.

“The many concerns that were raised about Mayor Bloomberg were about his record and what he had done in his business,” continued de Blasio. “You’re supposed to be put through those paces, especially if you’re a newcomer.”

Despite being unimpressed with Bloomberg’s first foray onto the debate stage in 2020, Cuomo said Bloomberg’s pockets are deep enough to paper over the performance.

“He has that advantage,” said Cuomo. “Cash is king.”

Additional reporting by Kevin Sheehan