20605204 has 24 divisors (see below), whose sum is σ = 37594368. Its totient is φ = 9870720.

The previous prime is 20605201. The next prime is 20605229. The reversal of 20605204 is 40250602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12492 + ... + 14044.

It is an arithmetic number, because the mean of its divisors is an integer number (1566432).

Almost surely, 2^20605204 is an apocalyptic number.

It is an amenable number.

20605204 is a deficient number, since it is larger than the sum of its proper divisors (16989164).

20605204 is a wasteful number, since it uses less digits than its factorization.

20605204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20605204 is about 4539.2955400591. The cubic root of 20605204 is about 274.1525603596.

Adding to 20605204 its reverse (40250602), we get a palindrome (60855806).

The spelling of 20605204 in words is "twenty million, six hundred five thousand, two hundred four".