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I must clarify that there is no historical record of a Scythian invasion of the Satavahana Empire in the Narmada region around 20 CE. The Scythians, also known as the Sakas, were indeed a nomadic people who migrated into parts of Central Asia and South Asia, but their incursions into India occurred later, primarily in the 1st century BCE and early 1st century CE. The Satavahana Empire, which ruled much of central and southern India, did face conflicts with the Sakas, but these events are not well-documented for the specific year of 20 CE.
If you are interested in the broader context of Scythian (Saka) interactions with the Satavahanas, I can provide a general overview of their historical conflicts and the impact of Saka incursions on the region. Let me know if you'd like me to proceed with that!