Oracle SQL MAX function not returning max on VARCHAR to NUMBER conversion -

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I am trying to get the highest system number from the set of rows from system number SYS First, the selection will be generated from table SYSTEM_ID , {SYS901, SYS87, SYS3024 .....}

this query I am trying to use:

select TABLE to MAX (REPLACE (SYSTEM_ID, 'SYS', ''))

possible The results are

{901,87,3024,20,1}

this 901 value where me 3024 I hope to see the value. I think the problem is that the field is a VARCHAR not a number . I do not know how to solve this problem. 

  select maximum (TO_NUMBER (REPLACE (SYSTEM_ID, 'SYS', ''))) From the table;

Use TO_NUMBER to convert VARCHAR2 to others Oracle compares the stars using its ASCII code ('9'> '3')

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