20305604 has 48 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 8624160.

The previous prime is 20305603. The next prime is 20305609. The reversal of 20305604 is 40650302.

It is not an unprimeable number, because it can be changed into a prime (20305601) 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 15 ways as a sum of consecutive naturals, for example, 89339 + ... + 89565.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^20305604 is an apocalyptic number.

It is an amenable number.

20305604 is an abundant number, since it is smaller than the sum of its proper divisors (21062716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20305604 is a wasteful number, since it uses less digits than its factorization.

20305604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20305604 is about 4506.1739868762. The cubic root of 20305604 is about 272.8173403665.

Adding to 20305604 its reverse (40650302), we get a palindrome (60955906).

The spelling of 20305604 in words is "twenty million, three hundred five thousand, six hundred four".