20002189 has 2 divisors, whose sum is σ = 20002190. Its totient is φ = 20002188.

The previous prime is 20002187. The next prime is 20002201. The reversal of 20002189 is 98120002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 1010025 = 4358^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002189 - 2¹ = 20002187 is a prime.

Together with 20002187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001094 + 10001095.

It is an arithmetic number, because the mean of its divisors is an integer number (10001095).

Almost surely, 2^20002189 is an apocalyptic number.

It is an amenable number.

20002189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002189 is an equidigital number, since it uses as much as digits as its factorization.

20002189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20002189 is about 4472.3806859434. The cubic root of 20002189 is about 271.4516643985.

The spelling of 20002189 in words is "twenty million, two thousand, one hundred eighty-nine".