20198205089 has 2 divisors, whose sum is σ = 20198205090. Its totient is φ = 20198205088.

The previous prime is 20198205061. The next prime is 20198205091. The reversal of 20198205089 is 98050289102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20066139025 + 132066064 = 141655^2 + 11492^2 .

It is a cyclic number.

It is not a de Polignac number, because 20198205089 - 2²⁸ = 19929769633 is a prime.

It is a Sophie Germain prime.

Together with 20198205091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20198205059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099102544 + 10099102545.

It is an arithmetic number, because the mean of its divisors is an integer number (10099102545).

Almost surely, 2^20198205089 is an apocalyptic number.

It is an amenable number.

20198205089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20198205089 is an equidigital number, since it uses as much as digits as its factorization.

20198205089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 20198205089 in words is "twenty billion, one hundred ninety-eight million, two hundred five thousand, eighty-nine".