20789189 has 4 divisors (see below), whose sum is σ = 21459840. Its totient is φ = 20118540.

The previous prime is 20789179. The next prime is 20789203. The reversal of 20789189 is 98198702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20789189 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 (20789179) 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, 335279 + ... + 335340.

It is an arithmetic number, because the mean of its divisors is an integer number (5364960).

Almost surely, 2^20789189 is an apocalyptic number.

It is an amenable number.

20789189 is a deficient number, since it is larger than the sum of its proper divisors (670651).

20789189 is an equidigital number, since it uses as much as digits as its factorization.

20789189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670650.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 20789189 is about 4559.5163120664. The cubic root of 20789189 is about 274.9661181397.

The spelling of 20789189 in words is "twenty million, seven hundred eighty-nine thousand, one hundred eighty-nine".