What is the meaning of all info in debugfs ls command

I have read the manual of gnu debugfs but didn’t find what I need.

When you issue a ls command, I don’t know the meaning of these numbers in parentheses.
Does anybody know ?

61917  (20) corr    134675  (16) .fonts    41617  (20) charsutf.txt   
54727  (12) fpn1    43739  (28) .node_repl_history    43149  (16) colors   
66957  (20) .edi.bak    50551  (24) .ediplus.bak0