It obviously depends on how much activity you have, which I'm going to assume is minimal to none because we have technology now :) If you were older this would be totally fine but since you are only 20 this may or may not be less than you need since you are still technically growing and stuff.
The number of calories a 20-year-old woman requires each day to maintain a healthy body weight is based on her size and activity level. According to the U.S. Department of Agriculture, women ages 19 to 30 require 2,400 calories if they are active, 2,000 to 2,200 calories if they are moderately active and about 1,800 to 2,000 calories each day for weight maintenance if they are sedentary. Weight-loss diets for 20-year-old women who are overweight consist of 1,000 to 1,600 calories per day, according to the U.S. Department of Health and Human Services.
healthyeating.sfgate.com/balanced-diet-20yearold-woman-2449.
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