20604320 has 96 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 7152640.

The previous prime is 20604317. The next prime is 20604347. The reversal of 20604320 is 2340602.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 40226 + ... + 40734.

It is an arithmetic number, because the mean of its divisors is an integer number (578340).

Almost surely, 2^20604320 is an apocalyptic number.

20604320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20604320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27760320).

20604320 is an abundant number, since it is smaller than the sum of its proper divisors (34916320).

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

20604320 is a wasteful number, since it uses less digits than its factorization.

20604320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20604320 is about 4539.1981670775. The cubic root of 20604320 is about 274.1486397590.

Adding to 20604320 its reverse (2340602), we get a palindrome (22944922).

The spelling of 20604320 in words is "twenty million, six hundred four thousand, three hundred twenty".