20203189 has 4 divisors (see below), whose sum is σ = 20214700. Its totient is φ = 20191680.

The previous prime is 20203187. The next prime is 20203217. The reversal of 20203189 is 98130202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15288100 + 4915089 = 3910^2 + 2217^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203189 - 2¹ = 20203187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514 + ... + 6835.

It is an arithmetic number, because the mean of its divisors is an integer number (5053675).

Almost surely, 2^20203189 is an apocalyptic number.

It is an amenable number.

20203189 is a deficient number, since it is larger than the sum of its proper divisors (11511).

20203189 is an equidigital number, since it uses as much as digits as its factorization.

20203189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20203189 is about 4494.7957684415. The cubic root of 20203189 is about 272.3578991460.

The spelling of 20203189 in words is "twenty million, two hundred three thousand, one hundred eighty-nine".