create table number_test (num number(38,20));
 
insert into number_test values (18204.53);
insert into number_test values (26583.19);
insert into number_test values (43373.84); 
 
select num from number_test order by 1;

18204,530000000000000000
26583,190000000003200000
43373,840000000006400000

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 Production
CORE 11.2.0.4.0 Production
TNS for Linux: Version 11.2.0.4.0 Production
NLSRTL Version 11.2.0.4.0 Production