104 (one hundred [and] four) is the natural number following 103 and preceding 105.
104 is a primitive semiperfect number and a composite number, with its divisors being 1, 2, 4, 8, 13, 26, 52 and 104. As it has 8 divisors total, and 8 is one of those divisors, 104 is a refactorable number. The distinct prime factors of 104 add up to 15, and so do the ones of 105, hence the two numbers form a Ruth-Aaron pair under the first definition.
In regular geometry, 104 is the smallest number of unit line segments that can exist in a plane with four of them touching at every vertex.
In other fields
104 is also: