20115538 has 4 divisors (see below), whose sum is σ = 30173310. Its totient is φ = 10057768.

The previous prime is 20115527. The next prime is 20115553. The reversal of 20115538 is 83551102.

It is a happy number.

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., 19421649 + 693889 = 4407^2 + 833^2 .

It is an unprimeable number.

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, 5028883 + ... + 5028886.

Almost surely, 2^20115538 is an apocalyptic number.

20115538 is a deficient number, since it is larger than the sum of its proper divisors (10057772).

20115538 is a wasteful number, since it uses less digits than its factorization.

20115538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057771.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 20115538 is about 4485.0348939557. The cubic root of 20115538 is about 271.9634556584.

The spelling of 20115538 in words is "twenty million, one hundred fifteen thousand, five hundred thirty-eight".