20855160881 has 2 divisors, whose sum is σ = 20855160882. Its totient is φ = 20855160880.

The previous prime is 20855160871. The next prime is 20855160883. The reversal of 20855160881 is 18806155802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16088639281 + 4766521600 = 126841^2 + 69040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20855160881 is a prime.

It is a super-3 number, since 3×20855160881³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 20855160883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20855160883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10427580440 + 10427580441.

It is an arithmetic number, because the mean of its divisors is an integer number (10427580441).

Almost surely, 2^20855160881 is an apocalyptic number.

It is an amenable number.

20855160881 is a deficient number, since it is larger than the sum of its proper divisors (1).

20855160881 is an equidigital number, since it uses as much as digits as its factorization.

20855160881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153600, while the sum is 44.

The spelling of 20855160881 in words is "twenty billion, eight hundred fifty-five million, one hundred sixty thousand, eight hundred eighty-one".