20685448073 has 2 divisors, whose sum is σ = 20685448074. Its totient is φ = 20685448072.

The previous prime is 20685448057. The next prime is 20685448081. The reversal of 20685448073 is 37084458602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20314230784 + 371217289 = 142528^2 + 19267^2 .

It is a cyclic number.

It is not a de Polignac number, because 20685448073 - 2⁴ = 20685448057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20685448573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342724036 + 10342724037.

It is an arithmetic number, because the mean of its divisors is an integer number (10342724037).

Almost surely, 2^20685448073 is an apocalyptic number.

It is an amenable number.

20685448073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685448073 is an equidigital number, since it uses as much as digits as its factorization.

20685448073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 20685448073 in words is "twenty billion, six hundred eighty-five million, four hundred forty-eight thousand, seventy-three".