accumulated 20 number one songs
... that Barbadian singer Rihanna accumulated 20 number one songs on the U.S. Hot Dance Club Songs chart in less than eight years?
... that Barbadian singer <a href="./Rihanna" id="mwCXY" rel="mw:WikiLink" title="Rihanna">Rihanna</a> <b id="mwCXc"><a class="mw-redirect" href="./Top_10_artists_with_the_most_number_ones_on_the_U.S._dance_chart" id="mwCXg" rel="mw:WikiLink" title="Top 10 artists with the most number ones on the U.S. dance chart">accumulated 20 number one songs</a></b> on the U.S. <a class="mw-redirect" href="./Hot_Dance_Club_Songs" id="mwCXk" rel="mw:WikiLink" title="Hot Dance Club Songs">Hot Dance Club Songs</a> chart in less than eight years?