20696539 has 4 divisors (see below), whose sum is σ = 20707624. Its totient is φ = 20685456.

The previous prime is 20696521. The next prime is 20696549. The reversal of 20696539 is 93569602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20696539 - 2⁷ = 20696411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20696549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1977 + ... + 6730.

It is an arithmetic number, because the mean of its divisors is an integer number (5176906).

Almost surely, 2^20696539 is an apocalyptic number.

20696539 is a deficient number, since it is larger than the sum of its proper divisors (11085).

20696539 is an equidigital number, since it uses as much as digits as its factorization.

20696539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11084.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 20696539 is about 4549.3448978946. The cubic root of 20696539 is about 274.5570345200.

The spelling of 20696539 in words is "twenty million, six hundred ninety-six thousand, five hundred thirty-nine".