20976679 has 4 divisors (see below), whose sum is σ = 20988576. Its totient is φ = 20964784.

The previous prime is 20976661. The next prime is 20976701. The reversal of 20976679 is 97667902.

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 20976679 - 2⁹ = 20976167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20976649) 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, 2719 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (5247144).

Almost surely, 2^20976679 is an apocalyptic number.

20976679 is a deficient number, since it is larger than the sum of its proper divisors (11897).

20976679 is an equidigital number, since it uses as much as digits as its factorization.

20976679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 20976679 is about 4580.0304584140. The cubic root of 20976679 is about 275.7902514432.

The spelling of 20976679 in words is "twenty million, nine hundred seventy-six thousand, six hundred seventy-nine".