19440, 38880, 58320 and so on.
240
The common multiples of 12 and 30 are 60, 180, 240, etc.
The common multiples of 10 and 16 are 80, 160, 240 and so on.
The common multiples of 15 and 16 are 240, 480, 720 and so on.
The common multiples of 3 and 16 are all multiples of their LCM, which is 48. Thus, their common multiples are 48, 96, 144, 192, 240, 288, etc.
240, 480, 720
The common multiples of 16 and 48 are any multiple of 48. Thus, the common multiples are 48, 96, 144, 192, 240, etc.
486, 972, 1458, 1944, and all of the other multiples of 486 are divisible by 486.
The multiples of 16 are 16, 32, 48, 64, 80, etc. The multiples of 20 are 20, 40, 60, 80, 100, etc. The common multiples of 16 and 20 are 80, 160, 240 and so on.
60, 120, 180, 240
120, 240, 360 and so on.
120, 240, 360 and so on.