Namely
Polysorbate 20 or Tween 20 is a nonionic surfactant and a sorbitol-derived emulsifier based on fruits and berries. It helps to dilute essential oils or perfume in water-based cosmetics like lotions, creams, gels.
Polysorbate 20 is produced by ethoxylation. The number indicates the average number of moles of ethylene oxide reacted per mole of sorbitol.