Difficulties convert decimal to varchar in db2

hi all
i want convert decimal(19) to varchar(19)
but i see sqlcode = 445
i must convert decimal(19) to varchar(20)
why ????

000000 6037691725312946. 40000
000000 6277601885430759. 106300
000000 6037991056116662. 200000
000000 627353106007884500 650000
000000 6037991474553322. 80000

after all result set" . "why ???
i don't want . in my result set
What can I do that my result are same as these (without" .")

000000 6037691725312946 40000
000000 6277601885430759 106300
000000 6037991056116662 200000
000000 627353106007884500 650000
000000 6037991474553322 80000

i can't use function (substrm)

tnx