The series is a sequence of three numbers, the second number is 3 greater than the first, and the third number is 5 greater than the second. (or 8 greater than the first)
20 + 3 = 23 : 23 + 5 = 28
14 + 3 = 17 : 17 + 5 = 22
11 + 3 = 14........is therefore the next number in the sequence.
108
3467910 is a single number: it is not a pattern!
Look at the difference between each number and the next number.
The next number is -21
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3
59 is the next number in this series.
The next number in the series is 67.
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
One number does not make a sequence (nor a series).
There is no series of number: just one very large number!
8
243
20
73791170
25
108