20087172 has 72 divisors (see below), whose sum is σ = 58822400. Its totient is φ = 5660928.

The previous prime is 20087143. The next prime is 20087213. The reversal of 20087172 is 27178002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19404 + ... + 20412.

Almost surely, 2^20087172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20087172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29411200).

20087172 is an abundant number, since it is smaller than the sum of its proper divisors (38735228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20087172 is a wasteful number, since it uses less digits than its factorization.

20087172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20087172 is about 4481.8714841013. The cubic root of 20087172 is about 271.8355587652.

It can be divided in two parts, 2008 and 7172, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 20087172 in words is "twenty million, eighty-seven thousand, one hundred seventy-two".