20138992 has 20 divisors (see below), whose sum is σ = 40365720. Its totient is φ = 9722048.

The previous prime is 20138981. The next prime is 20139011. The reversal of 20138992 is 29983102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21238 + ... + 22165.

It is an arithmetic number, because the mean of its divisors is an integer number (2018286).

Almost surely, 2^20138992 is an apocalyptic number.

It is an amenable number.

20138992 is an abundant number, since it is smaller than the sum of its proper divisors (20226728).

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

20138992 is a wasteful number, since it uses less digits than its factorization.

20138992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43440 (or 43434 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20138992 is about 4487.6488276156. The cubic root of 20138992 is about 272.0691145013.

It can be divided in two parts, 201 and 38992, that added together give a palindrome (39193).

The spelling of 20138992 in words is "twenty million, one hundred thirty-eight thousand, nine hundred ninety-two".