20138874 has 16 divisors (see below), whose sum is σ = 46031808. Its totient is φ = 5753952.

The previous prime is 20138851. The next prime is 20138903. The reversal of 20138874 is 47883102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239707 + ... + 239790.

It is an arithmetic number, because the mean of its divisors is an integer number (2876988).

Almost surely, 2^20138874 is an apocalyptic number.

20138874 is an abundant number, since it is smaller than the sum of its proper divisors (25892934).

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

20138874 is a wasteful number, since it uses less digits than its factorization.

20138874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479509.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 20138874 is about 4487.6356804001. The cubic root of 20138874 is about 272.0685831238.

It can be divided in two parts, 20138 and 874, that added together give a palindrome (21012).

The spelling of 20138874 in words is "twenty million, one hundred thirty-eight thousand, eight hundred seventy-four".