20192172 has 144 divisors (see below), whose sum is σ = 64839936. Its totient is φ = 4723200.

The previous prime is 20192171. The next prime is 20192177. The reversal of 20192172 is 27129102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20192171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 492472 + ... + 492512.

Almost surely, 2^20192172 is an apocalyptic number.

20192172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20192172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32419968).

20192172 is an abundant number, since it is smaller than the sum of its proper divisors (44647764).

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

20192172 is a wasteful number, since it uses less digits than its factorization.

20192172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 20192172 is about 4493.5700728930. The cubic root of 20192172 is about 272.3083836536.

The spelling of 20192172 in words is "twenty million, one hundred ninety-two thousand, one hundred seventy-two".