20789473 has 4 divisors (see below), whose sum is σ = 20821680. Its totient is φ = 20757268.

The previous prime is 20789443. The next prime is 20789507. The reversal of 20789473 is 37498702.

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 20789473 - 2⁵ = 20789441 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20789413) 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 3 ways as a sum of consecutive naturals, for example, 15115 + ... + 16432.

It is an arithmetic number, because the mean of its divisors is an integer number (5205420).

Almost surely, 2^20789473 is an apocalyptic number.

It is an amenable number.

20789473 is a deficient number, since it is larger than the sum of its proper divisors (32207).

20789473 is an equidigital number, since it uses as much as digits as its factorization.

20789473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32206.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20789473 is about 4559.5474556144. The cubic root of 20789473 is about 274.9673702332.

The spelling of 20789473 in words is "twenty million, seven hundred eighty-nine thousand, four hundred seventy-three".