20195089 has 2 divisors, whose sum is σ = 20195090. Its totient is φ = 20195088.

The previous prime is 20195059. The next prime is 20195111. The reversal of 20195089 is 98059102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 5602689 = 3820^2 + 2367^2 .

It is a cyclic number.

It is not a de Polignac number, because 20195089 - 2⁵ = 20195057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20195009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097544 + 10097545.

It is an arithmetic number, because the mean of its divisors is an integer number (10097545).

Almost surely, 2^20195089 is an apocalyptic number.

It is an amenable number.

20195089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20195089 is an equidigital number, since it uses as much as digits as its factorization.

20195089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 20195089 is about 4493.8946360590. The cubic root of 20195089 is about 272.3214957531.

The spelling of 20195089 in words is "twenty million, one hundred ninety-five thousand, eighty-nine".