20604043 has 4 divisors (see below), whose sum is σ = 20637328. Its totient is φ = 20570760.

The previous prime is 20604019. The next prime is 20604047. The reversal of 20604043 is 34040602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34040602 = 2 ⋅17020301.

It is a cyclic number.

It is not a de Polignac number, because 20604043 - 2⁵ = 20604011 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 20604043.

It is not an unprimeable number, because it can be changed into a prime (20604047) 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, 15696 + ... + 16957.

It is an arithmetic number, because the mean of its divisors is an integer number (5159332).

Almost surely, 2^20604043 is an apocalyptic number.

20604043 is a deficient number, since it is larger than the sum of its proper divisors (33285).

20604043 is an equidigital number, since it uses as much as digits as its factorization.

20604043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33284.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20604043 is about 4539.1676549782. The cubic root of 20604043 is about 274.1474112219.

Adding to 20604043 its reverse (34040602), we get a palindrome (54644645).

The spelling of 20604043 in words is "twenty million, six hundred four thousand, forty-three".