The actor-turned producer, who donated the amount to a kids' charity, used his all life lines before reaching the final stage on 'Ke Hobe Banglar Kotipoti' and gave correct answers after some friendly tiffs with Kiran.
The star couple were the first to win the huge amount on the regional game show, with the highest prize money being Rs 25 lakh won by a commoner previously.
After being told that they were the first winners of the amount, Aamir and Kiran exclaimed, "Oh! Is it?"
When Ganguly, 39, said that Aamir's answers for the last two posers - about the emblem within the Hyderabad Nizam's first flag and India sharing the longest boundary with which neigbhouring country - were bang on target, Kiran said, "He is like this always, very clear in thoughts and precise with keen interest in history and geography.
"He also never gets worked up in a situation." The couple said the entire amount would go to Saraswati Mandir Trust, a children's charity.
Conversation on the show, aired on the former Indian skipper's birthday, steered towards Aamir's latest film 'Delhi Belly'.
Joking that it is time for item girls to pack up, Aamir, 46, said that his 'I hate you, like I love you' number in the film is a tribute to the disco era of the 1980s.
"The dance number is my tribute to that golden era of Bappida (Lahiri) and Mithunda (Chakarvarty). This is to all those who belonged to that era - Amitabh Bachchan, Rishi Kapoor, Jeetendra and Govinda."
To a question by Ganguly, Aamir said he would not want children watching the episode flocking to cineplexes to see 'Delhi Belly' "as it is an adult comedy but very youthful and a lot irreverent."