20676779 has 4 divisors (see below), whose sum is σ = 20699784. Its totient is φ = 20653776.

The previous prime is 20676707. The next prime is 20676781. The reversal of 20676779 is 97767602.

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 20676779 - 2¹² = 20672683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20676979) 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, 10097 + ... + 11970.

It is an arithmetic number, because the mean of its divisors is an integer number (5174946).

Almost surely, 2^20676779 is an apocalyptic number.

20676779 is a deficient number, since it is larger than the sum of its proper divisors (23005).

20676779 is an equidigital number, since it uses as much as digits as its factorization.

20676779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23004.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 20676779 is about 4547.1726380246. The cubic root of 20676779 is about 274.4696290122.

The spelling of 20676779 in words is "twenty million, six hundred seventy-six thousand, seven hundred seventy-nine".