20525189 has 2 divisors, whose sum is σ = 20525190. Its totient is φ = 20525188.

The previous prime is 20525159. The next prime is 20525213. The reversal of 20525189 is 98152502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10349089 + 10176100 = 3217^2 + 3190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20525129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262594 + 10262595.

It is an arithmetic number, because the mean of its divisors is an integer number (10262595).

Almost surely, 2^20525189 is an apocalyptic number.

It is an amenable number.

20525189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525189 is an equidigital number, since it uses as much as digits as its factorization.

20525189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20525189 is about 4530.4733748252. The cubic root of 20525189 is about 273.7972330806.

The spelling of 20525189 in words is "twenty million, five hundred twenty-five thousand, one hundred eighty-nine".