20602985017889 has 2 divisors, whose sum is σ = 20602985017890. Its totient is φ = 20602985017888.

The previous prime is 20602985017819. The next prime is 20602985017991. The reversal of 20602985017889 is 98871058920602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18767480301025 + 1835504716864 = 4332145^2 + 1354808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20602985017889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20602985017819) 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, 10301492508944 + 10301492508945.

It is an arithmetic number, because the mean of its divisors is an integer number (10301492508945).

Almost surely, 2^{20602985017889} is an apocalyptic number.

It is an amenable number.

20602985017889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20602985017889 is an equidigital number, since it uses as much as digits as its factorization.

20602985017889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 65.

The spelling of 20602985017889 in words is "twenty trillion, six hundred two billion, nine hundred eighty-five million, seventeen thousand, eight hundred eighty-nine".