20079681 has 4 divisors (see below), whose sum is σ = 26772912. Its totient is φ = 13386452.

The previous prime is 20079677. The next prime is 20079701. The reversal of 20079681 is 18697002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20079681 - 2² = 20079677 is a prime.

It is a super-2 number, since 2×20079681² = 806387178123522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20079611) 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, 3346611 + ... + 3346616.

It is an arithmetic number, because the mean of its divisors is an integer number (6693228).

Almost surely, 2^20079681 is an apocalyptic number.

It is an amenable number.

20079681 is a deficient number, since it is larger than the sum of its proper divisors (6693231).

20079681 is an equidigital number, since it uses as much as digits as its factorization.

20079681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6693230.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20079681 is about 4481.0357061733. The cubic root of 20079681 is about 271.8017631774.

The spelling of 20079681 in words is "twenty million, seventy-nine thousand, six hundred eighty-one".