M20 are the descendants of the Indian Clan and undertook the settlement of India 30,000 years ago. M20 was first known as the group M9 that ventured south of the mountains of Pamir Knot into India before acquiring the marker M20.
Southern Indians hold a closer lineage to the marker than Northern Indian populations which are more affected by the waves of immigration.
M20 were not the first migrants to arrive in India. They were preceded by early coastal migrants who had been there four tens of thousands of years in the south.
M 20 is not often found outside of India.