20331303331187 has 2 divisors, whose sum is σ = 20331303331188. Its totient is φ = 20331303331186.

The previous prime is 20331303331169. The next prime is 20331303331249. The reversal of 20331303331187 is 78113330313302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331303331187 - 2⁶ = 20331303331123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20331303331187.

It is not a weakly prime, because it can be changed into another prime (20331303331147) 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, 10165651665593 + 10165651665594.

It is an arithmetic number, because the mean of its divisors is an integer number (10165651665594).

Almost surely, 2^{20331303331187} is an apocalyptic number.

20331303331187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331303331187 is an equidigital number, since it uses as much as digits as its factorization.

20331303331187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

Adding to 20331303331187 its reverse (78113330313302), we get a palindrome (98444633644489).

The spelling of 20331303331187 in words is "twenty trillion, three hundred thirty-one billion, three hundred three million, three hundred thirty-one thousand, one hundred eighty-seven".