Parodia microsperma

Parodia microsperma or Parodia ruellihamata 

Water requirements: drought-tolerant Water regularly; do not overwater. Regular water in the summer. Do not overwater. Keep rather dry in winter. It rots easily if the substrate is wet and cold, tends to lose its roots in winter.
Sun exposure: Sun to partial shade, light shade
Hardiness:
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
USDA Zone 11: above 4.5 °C (40 °F)
Bloom color: Orange
Bloom time: Mid Spring, Late Spring/Early Summer

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz