The total number of points is twenty (5)
I believe the answer is:
score
I believe this clue is a quadruple definition!!
'the total' is the first definition.
(I have seen 'Total of points ' mean 'score' so perhaps 'total' could also mean 'score')
'number' is the second definition.
(score is a kind of number)
'of' acts as a link.
'points' is the third definition.
(I've seen this before)
'is twenty' is the fourth definition.
(synonyms)
(Other definitions for score that I've seen before include "Group of 20" , "Gain a point (20 of them?)" , "Shoot a goal for a twenty" , "Result" , "Tally; 20" .)