From Innerpedia - Encyclopedia of Torah's Inner Dimension - Chassidut and Kabbalah
In number theory
- The prime factorization of 1820 is 2, 2, 5, 7, 13
- 1820 is the 35th chashmal (pentagonal) number
- 1820 is the 13th 4-dimensional triangular number
In the Bible
- 1820 is the number of times God's essential Name, Havayah (י-הוה) appears in the Pentateuch.