20685448039 has 2 divisors, whose sum is σ = 20685448040. Its totient is φ = 20685448038.

The previous prime is 20685447997. The next prime is 20685448057. The reversal of 20685448039 is 93084458602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20685448039 - 2¹³ = 20685439847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20685447983 and 20685448001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20685448739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342724019 + 10342724020.

It is an arithmetic number, because the mean of its divisors is an integer number (10342724020).

Almost surely, 2^20685448039 is an apocalyptic number.

20685448039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685448039 is an equidigital number, since it uses as much as digits as its factorization.

20685448039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 20685448039 in words is "twenty billion, six hundred eighty-five million, four hundred forty-eight thousand, thirty-nine".