20104789 has 4 divisors (see below), whose sum is σ = 20359360. Its totient is φ = 19850220.

The previous prime is 20104787. The next prime is 20104811. The reversal of 20104789 is 98740102.

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 not a de Polignac number, because 20104789 - 2¹ = 20104787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20104789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104787) 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, 127167 + ... + 127324.

It is an arithmetic number, because the mean of its divisors is an integer number (5089840).

Almost surely, 2^20104789 is an apocalyptic number.

It is an amenable number.

20104789 is a deficient number, since it is larger than the sum of its proper divisors (254571).

20104789 is an equidigital number, since it uses as much as digits as its factorization.

20104789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254570.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20104789 is about 4483.8364153925. The cubic root of 20104789 is about 271.9150046211.

The spelling of 20104789 in words is "twenty million, one hundred four thousand, seven hundred eighty-nine".