20604245 has 4 divisors (see below), whose sum is σ = 24725100. Its totient is φ = 16483392.

The previous prime is 20604211. The next prime is 20604247. The reversal of 20604245 is 54240602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8375236 + 12229009 = 2894^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604245 - 2¹² = 20600149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20604245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604247) 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, 2060420 + ... + 2060429.

It is an arithmetic number, because the mean of its divisors is an integer number (6181275).

Almost surely, 2^20604245 is an apocalyptic number.

It is an amenable number.

20604245 is a deficient number, since it is larger than the sum of its proper divisors (4120855).

20604245 is an equidigital number, since it uses as much as digits as its factorization.

20604245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120854.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20604245 is about 4539.1899056990. The cubic root of 20604245 is about 274.1483071237.

Adding to 20604245 its reverse (54240602), we get a palindrome (74844847).

The spelling of 20604245 in words is "twenty million, six hundred four thousand, two hundred forty-five".