During a meeting from their school mathematics club, Andy, Becky, Chloe and Danny discover that their favourite number (a positive integer) is the same. So, each of the four friends makes three statements about the number, at least one of which is true and at least one of which is false.
Andy:Becky:Chloe:Danny:(A1)(A2)(A3)(B1)(B2)(B3)(C1)(C2)(C3)(D1)(D2)(D3)The number is less than 127 does not divide the number5 times the number is less than 7012 times the number is greater than 100010 divides the numberThe number is greater than 1004 divides the number11 times the number is less than 10009 divides the numberThe number is less than 20The number is a prime number7 divides the number
What is their favorite number?