20875538 has 4 divisors (see below), whose sum is σ = 31313310. Its totient is φ = 10437768.

The previous prime is 20875531. The next prime is 20875549. The reversal of 20875538 is 83557802.

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., 20367169 + 508369 = 4513^2 + 713^2 .

It is not an unprimeable number, because it can be changed into a prime (20875531) 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 as a sum of consecutive naturals, namely, 5218883 + ... + 5218886.

Almost surely, 2^20875538 is an apocalyptic number.

20875538 is a deficient number, since it is larger than the sum of its proper divisors (10437772).

20875538 is a wasteful number, since it uses less digits than its factorization.

20875538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437771.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 20875538 is about 4568.9755963454. The cubic root of 20875538 is about 275.3462877287.

The spelling of 20875538 in words is "twenty million, eight hundred seventy-five thousand, five hundred thirty-eight".