The 73-year-old megastar beaten his contemporaries Shah Rukh Khan (17.5 million), Aamir Khan (16,2 million), Salman Khan (15.8 million) and Priyanka Chopra (12.5 million) with his new milestone.
Bachchan's Twitter account became live in May, 2010 and ever since has been a one stop destination for his fans to connect, interact and engage with the actor.
"In all the excitement of retweeting the 19 million on Twitter... Forgot the 34 yrs of 'Satte Pe Satta'," he tweeted.
"Satte Pe Satta", an action comedy, was an adaptation of 1954 Hollywood film "Seven Brides for Seven Brothers". Besides starring Bachchan in a prominent role, the Raj N Sippy-directed film starred Hema Malini, Amjad Khan and Sachin.