20779723 has 2 divisors, whose sum is σ = 20779724. Its totient is φ = 20779722.

The previous prime is 20779697. The next prime is 20779727. The reversal of 20779723 is 32797702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20779723 is a prime.

It is not a weakly prime, because it can be changed into another prime (20779727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389861 + 10389862.

It is an arithmetic number, because the mean of its divisors is an integer number (10389862).

Almost surely, 2^20779723 is an apocalyptic number.

20779723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779723 is an equidigital number, since it uses as much as digits as its factorization.

20779723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 20779723 is about 4558.4781451708. The cubic root of 20779723 is about 274.9243781048.

The spelling of 20779723 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred twenty-three".