Passage: According to the 2011 census, the population of Mumbai city was 12,479,608. The population density is estimated to be about 20,482 persons per square kilometre. The living space is 4.5 square metres per person. Mumbai Metropolitan Region was home to 20,748,395 people by 2011. Greater Mumbai, the area under the administration of the MCGM, has a literacy rate of 94.7%, higher than the national average of 86.7%. The number of slum-dwellers is estimated to be 9 million, up from 6 million in 2001; that is, 62% of all Mumbaikars live in informal slums.

Question: what is the estimated person per square kilo?
20,482