20508189 has 16 divisors (see below), whose sum is σ = 29529024. Its totient is φ = 12585600.

The previous prime is 20508167. The next prime is 20508197. The reversal of 20508189 is 98180502.

It is a happy number.

It is not a de Polignac number, because 20508189 - 2¹⁷ = 20377117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26569 + ... + 27329.

It is an arithmetic number, because the mean of its divisors is an integer number (1845564).

Almost surely, 2^20508189 is an apocalyptic number.

It is an amenable number.

20508189 is a deficient number, since it is larger than the sum of its proper divisors (9020835).

20508189 is a wasteful number, since it uses less digits than its factorization.

20508189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20508189 is about 4528.5968025427. The cubic root of 20508189 is about 273.7216212945.

The spelling of 20508189 in words is "twenty million, five hundred eight thousand, one hundred eighty-nine".