20104538 has 4 divisors (see below), whose sum is σ = 30156810. Its totient is φ = 10052268.

The previous prime is 20104537. The next prime is 20104549. The reversal of 20104538 is 83540102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20043529 + 61009 = 4477^2 + 247^2 .

It is not an unprimeable number, because it can be changed into a prime (20104531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026133 + ... + 5026136.

Almost surely, 2^20104538 is an apocalyptic number.

20104538 is a deficient number, since it is larger than the sum of its proper divisors (10052272).

20104538 is a wasteful number, since it uses less digits than its factorization.

20104538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052271.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20104538 is about 4483.8084258808. The cubic root of 20104538 is about 271.9138730341.

The spelling of 20104538 in words is "twenty million, one hundred four thousand, five hundred thirty-eight".