20892172 has 48 divisors (see below), whose sum is σ = 44432640. Its totient is φ = 8396352.

The previous prime is 20892169. The next prime is 20892173. The reversal of 20892172 is 27129802.

It is not an unprimeable number, because it can be changed into a prime (20892173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91923 + ... + 92149.

It is an arithmetic number, because the mean of its divisors is an integer number (925680).

Almost surely, 2^20892172 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 20892172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22216320).

20892172 is an abundant number, since it is smaller than the sum of its proper divisors (23540468).

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

20892172 is a wasteful number, since it uses less digits than its factorization.

20892172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20892172 is about 4570.7955543866. The cubic root of 20892172 is about 275.4194019191.

The spelling of 20892172 in words is "twenty million, eight hundred ninety-two thousand, one hundred seventy-two".