Num of partitions != num.partitions in config

Hi,

I have Kafka 0.8.1.1 running and configured to have 24 partitions:
$ grep partition /usr/lib/kafka_2.8.0-0.8.1.1/config/server.properties
# The default number of log partitions per topic. More partitions allow
greater
num.partitions=24

But some of the topics don't seem to have 24 partitions, like this one:

$ ls -la spm_af_alerts*

drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-0
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-1
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-10
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-11
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-2
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-3
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-4
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-5
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-6
drwxrwxr-x 2 ec2-user ec2-user 4096 May 31 14:49 spm_af_alerts_topic-7
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-8
drwxrwxr-x 2 ec2-user ec2-user 4096 May 30 07:43 spm_af_alerts_topic-9

How is this possible? That -N at the end represents the partition number,
right?

Thanks,
Otis