20937172 has 12 divisors (see below), whose sum is σ = 36730036. Its totient is φ = 10442880.

The previous prime is 20937157. The next prime is 20937179. The reversal of 20937172 is 27173902.

It can be written as a sum of positive squares in 2 ways, for example, as 992016 + 19945156 = 996^2 + 4466^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4533 + ... + 7900.

Almost surely, 2^20937172 is an apocalyptic number.

It is an amenable number.

20937172 is a deficient number, since it is larger than the sum of its proper divisors (15792864).

20937172 is a wasteful number, since it uses less digits than its factorization.

20937172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12858 (or 12856 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20937172 is about 4575.7154631817. The cubic root of 20937172 is about 275.6170036056.

The spelling of 20937172 in words is "twenty million, nine hundred thirty-seven thousand, one hundred seventy-two".