How can I lower position of page number?

Question

\documentclass{mwrep}

%margins
\usepackage{anysize}
\marginsize{3cm}{3cm}{2cm}{2cm}

\usepackage{lipsum}

\usepackage{fancyhdr}
\pagestyle{fancy}
\lhead{}\chead{}\rhead{}\lfoot{}\cfoot{}\rfoot{\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

\begin{document}
\chapter{AAAAAAA}
\section{aaaaaaa}
\lipsum
\section{bbbbbbb}
\lipsum
\section{ccccccc}
\lipsum
\chapter{BBBBBBB}
\section{aaaaaaa}
\lipsum
\section{bbbbbbb}
\lipsum
\section{ccccccc}
\lipsum
\chapter{CCCCCCC}
\section{aaaaaaa}
\lipsum
\section{bbbbbbb}
\lipsum
\section{ccccccc}
\lipsum
\end{document}

How can I lower the page number (something about 0.5 cm) without modyfying the rest of page?
(Only visible change should be different position of page number).

Answer 1

The length dictating the distance between the text block and your page number (contained within the footer), is \footskip. Modifying the length will only move the footer up/down. For example, add

\setlength{\footskip}{20pt}

in your document preamble to have a 20pt gap between the text block and the footer.

For more on lengths between document elements, consider reading the documentations of layouts and geometry.