The value of ⌊ 2020/(1+2+3+...+2019)⌋ is derived from analyzing the factorials involved. The discussion outlines a method to express n! in terms of sums of factorials, leading to inequalities that help establish bounds. It concludes that for n ≥ 4, the relationship holds that n! is greater than a certain sum of factorials. By applying this reasoning specifically for n = 2010, the final result is determined to be 2018. Thus, the value of the original expression is 2018.