20863123187 has 2 divisors, whose sum is σ = 20863123188. Its totient is φ = 20863123186.

The previous prime is 20863123121. The next prime is 20863123243. The reversal of 20863123187 is 78132136802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20863123187 is a prime.

It is not a weakly prime, because it can be changed into another prime (20863123387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431561593 + 10431561594.

It is an arithmetic number, because the mean of its divisors is an integer number (10431561594).

Almost surely, 2^20863123187 is an apocalyptic number.

20863123187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863123187 is an equidigital number, since it uses as much as digits as its factorization.

20863123187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

Adding to 20863123187 its reverse (78132136802), we get a palindrome (98995259989).

The spelling of 20863123187 in words is "twenty billion, eight hundred sixty-three million, one hundred twenty-three thousand, one hundred eighty-seven".