30

is the integer between.

Math features

 * 30 is an even number.
 * 30 is a composite number and an abundant number.
 * 30 is a pronic number.
 * 30 is a square pyramidal number.
 * 30 is the first number with 3 distinct prime factors. Therefore, 30 is a primorial.
 * 30 is the first square-free integer which is not a semiprime.
 * 30 is a Harshad number.
 * 30 is the sum of 2 consecutive prime numbers, which are 13 and 17.