20673755934397 has 2 divisors, whose sum is σ = 20673755934398. Its totient is φ = 20673755934396.

The previous prime is 20673755934389. The next prime is 20673755934431. The reversal of 20673755934397 is 79343955737602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20369597066361 + 304158868036 = 4513269^2 + 551506^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673755934397 - 2³ = 20673755934389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673755934367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336877967198 + 10336877967199.

It is an arithmetic number, because the mean of its divisors is an integer number (10336877967199).

Almost surely, 2^{20673755934397} is an apocalyptic number.

It is an amenable number.

20673755934397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673755934397 is an equidigital number, since it uses as much as digits as its factorization.

20673755934397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900169200, while the sum is 70.

The spelling of 20673755934397 in words is "twenty trillion, six hundred seventy-three billion, seven hundred fifty-five million, nine hundred thirty-four thousand, three hundred ninety-seven".