20768519 has 4 divisors (see below), whose sum is σ = 20867160. Its totient is φ = 20669880.

The previous prime is 20768497. The next prime is 20768549. The reversal of 20768519 is 91586702.

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

It is a cyclic number.

It is not a de Polignac number, because 20768519 - 2²⁰ = 19719943 is a prime.

It is a super-2 number, since 2×20768519² = 862662762906722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49004 + ... + 49425.

It is an arithmetic number, because the mean of its divisors is an integer number (5216790).

Almost surely, 2^20768519 is an apocalyptic number.

20768519 is a deficient number, since it is larger than the sum of its proper divisors (98641).

20768519 is an equidigital number, since it uses as much as digits as its factorization.

20768519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98640.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20768519 is about 4557.2490605627. The cubic root of 20768519 is about 274.8749580283.

The spelling of 20768519 in words is "twenty million, seven hundred sixty-eight thousand, five hundred nineteen".