20316779 has 4 divisors (see below), whose sum is σ = 23219184. Its totient is φ = 17414376.

The previous prime is 20316767. The next prime is 20316781. The reversal of 20316779 is 97761302.

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

It is not a de Polignac number, because 20316779 - 2⁸ = 20316523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20316799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451192 + ... + 1451205.

It is an arithmetic number, because the mean of its divisors is an integer number (5804796).

Almost surely, 2^20316779 is an apocalyptic number.

20316779 is a deficient number, since it is larger than the sum of its proper divisors (2902405).

20316779 is an equidigital number, since it uses as much as digits as its factorization.

20316779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902404.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20316779 is about 4507.4137817600. The cubic root of 20316779 is about 272.8673786822.

The spelling of 20316779 in words is "twenty million, three hundred sixteen thousand, seven hundred seventy-nine".