20773431606439 has 2 divisors, whose sum is σ = 20773431606440. Its totient is φ = 20773431606438.

The previous prime is 20773431606371. The next prime is 20773431606449. The reversal of 20773431606439 is 93460613437702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20773431606439 - 2³¹ = 20771284122791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20773431606439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20773431606449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386715803219 + 10386715803220.

It is an arithmetic number, because the mean of its divisors is an integer number (10386715803220).

Almost surely, 2^{20773431606439} is an apocalyptic number.

20773431606439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773431606439 is an equidigital number, since it uses as much as digits as its factorization.

20773431606439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13716864, while the sum is 55.

The spelling of 20773431606439 in words is "twenty trillion, seven hundred seventy-three billion, four hundred thirty-one million, six hundred six thousand, four hundred thirty-nine".