20138704 has 20 divisors (see below), whose sum is σ = 39272164. Its totient is φ = 10003968.

The previous prime is 20138669. The next prime is 20138707. The reversal of 20138704 is 40783102.

It can be written as a sum of positive squares in 2 ways, for example, as 8714304 + 11424400 = 2952^2 + 3380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1497 + ... + 6520.

Almost surely, 2^20138704 is an apocalyptic number.

It is an amenable number.

20138704 is a deficient number, since it is larger than the sum of its proper divisors (19133460).

20138704 is a wasteful number, since it uses less digits than its factorization.

20138704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182 (or 8176 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20138704 is about 4487.6167394286. The cubic root of 20138704 is about 272.0678175764.

The spelling of 20138704 in words is "twenty million, one hundred thirty-eight thousand, seven hundred four".