220 = 22 x 5 x 11.
220 is the 10th tetrahedral number.
220 and 284 form the first and smallest pair of amicable numbers. Each is the sum of the aliqot parts of the other. The aliquot parts of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, and 110 and total 284. 284 = 22 x 71 and its aliquot parts are 1, 2, 4, 71, and 142, totalling 220.
220 and 284 form the first and smallest pair of amicable numbers. Each is the sum of the aliqot parts of the other. The aliquot parts of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, and 110 and total 284. 284 = 22 x 71 and its aliquot parts are 1, 2, 4, 71, and 142, totalling 220.
220 is a number that cannot be written as a sum of three squares.
In the Bible, 220 was the number of goats Jacob gave to his brother Esau ("two hundred she-goats and twenty he-goats") and the number of sheep ("two hundred ewes and twenty rams," Genesis 32:14).
Source: VirtueScience.com
In the Bible, 220 was the number of goats Jacob gave to his brother Esau ("two hundred she-goats and twenty he-goats") and the number of sheep ("two hundred ewes and twenty rams," Genesis 32:14).
Source: VirtueScience.com
