20685442883047 has 2 divisors, whose sum is σ = 20685442883048. Its totient is φ = 20685442883046.

The previous prime is 20685442882927. The next prime is 20685442883051. The reversal of 20685442883047 is 74038824458602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20685442883047 - 2²⁷ = 20685308665319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20685442883647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342721441523 + 10342721441524.

It is an arithmetic number, because the mean of its divisors is an integer number (10342721441524).

Almost surely, 2^{20685442883047} is an apocalyptic number.

20685442883047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20685442883047 is an equidigital number, since it uses as much as digits as its factorization.

20685442883047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82575360, while the sum is 61.

The spelling of 20685442883047 in words is "twenty trillion, six hundred eighty-five billion, four hundred forty-two million, eight hundred eighty-three thousand, forty-seven".