20538189 has 24 divisors (see below), whose sum is σ = 34549632. Its totient is φ = 11512800.

The previous prime is 20538187. The next prime is 20538211. The reversal of 20538189 is 98183502.

It is not a de Polignac number, because 20538189 - 2¹ = 20538187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20538181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 264 + ... + 6414.

It is an arithmetic number, because the mean of its divisors is an integer number (1439568).

Almost surely, 2^20538189 is an apocalyptic number.

It is an amenable number.

20538189 is a deficient number, since it is larger than the sum of its proper divisors (14011443).

20538189 is a wasteful number, since it uses less digits than its factorization.

20538189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6217 (or 6214 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20538189 is about 4531.9078763805. The cubic root of 20538189 is about 273.8550256923.

The spelling of 20538189 in words is "twenty million, five hundred thirty-eight thousand, one hundred eighty-nine".