20538764 has 6 divisors (see below), whose sum is σ = 35942844. Its totient is φ = 10269380.

The previous prime is 20538691. The next prime is 20538773. The reversal of 20538764 is 46783502.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2567342 + ... + 2567349.

It is an arithmetic number, because the mean of its divisors is an integer number (5990474).

Almost surely, 2^20538764 is an apocalyptic number.

It is an amenable number.

20538764 is a deficient number, since it is larger than the sum of its proper divisors (15404080).

20538764 is a wasteful number, since it uses less digits than its factorization.

20538764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5134695 (or 5134693 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20538764 is about 4531.9713150019. The cubic root of 20538764 is about 273.8575813407.

The spelling of 20538764 in words is "twenty million, five hundred thirty-eight thousand, seven hundred sixty-four".