20773966417 has 4 divisors (see below), whose sum is σ = 21007381860. Its totient is φ = 20540550976.

The previous prime is 20773966403. The next prime is 20773966439. The reversal of 20773966417 is 71466937702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11527028496 + 9246937921 = 107364^2 + 96161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20773966417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20773966817) 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, 116707588 + ... + 116707765.

It is an arithmetic number, because the mean of its divisors is an integer number (5251845465).

Almost surely, 2^20773966417 is an apocalyptic number.

It is an amenable number.

20773966417 is a deficient number, since it is larger than the sum of its proper divisors (233415443).

20773966417 is an equidigital number, since it uses as much as digits as its factorization.

20773966417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233415442.

The product of its (nonzero) digits is 2667168, while the sum is 52.

The spelling of 20773966417 in words is "twenty billion, seven hundred seventy-three million, nine hundred sixty-six thousand, four hundred seventeen".