The hex color #20917f is a dark color. The web-safe version is Hex
#339966. A complementary color is
#DF6E80. The grayscale version is
#656565. A 20% lighter version of the original color is
#53C4B2, and Hex
#005E4C is the 20% darker color. If the color is saturated by 10%, you get
#199582. If the color is desaturated by 10%, the color
#278D7C is obtained.