20773456909 has 2 divisors, whose sum is σ = 20773456910. Its totient is φ = 20773456908.

The previous prime is 20773456877. The next prime is 20773456931. The reversal of 20773456909 is 90965437702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20773456900 + 9 = 144130^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773456909 - 2⁵ = 20773456877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20773456309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386728454 + 10386728455.

It is an arithmetic number, because the mean of its divisors is an integer number (10386728455).

Almost surely, 2^20773456909 is an apocalyptic number.

It is an amenable number.

20773456909 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773456909 is an equidigital number, since it uses as much as digits as its factorization.

20773456909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 20773456909 in words is "twenty billion, seven hundred seventy-three million, four hundred fifty-six thousand, nine hundred nine".