20779739 has 2 divisors, whose sum is σ = 20779740. Its totient is φ = 20779738.

The previous prime is 20779727. The next prime is 20779751. The reversal of 20779739 is 93797702.

It is a balanced prime because it is at equal distance from previous prime (20779727) and next prime (20779751).

It is a cyclic number.

It is not a de Polignac number, because 20779739 - 2⁴ = 20779723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20779739.

It is not a weakly prime, because it can be changed into another prime (20779769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389869 + 10389870.

It is an arithmetic number, because the mean of its divisors is an integer number (10389870).

Almost surely, 2^20779739 is an apocalyptic number.

20779739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779739 is an equidigital number, since it uses as much as digits as its factorization.

20779739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 20779739 is about 4558.4799001422. The cubic root of 20779739 is about 274.9244486670.

The spelling of 20779739 in words is "twenty million, seven hundred seventy-nine thousand, seven hundred thirty-nine".