20320004 has 12 divisors (see below), whose sum is σ = 36707328. Its totient is φ = 9832200.

The previous prime is 20319989. The next prime is 20320007. The reversal of 20320004 is 40002302.

It is not an unprimeable number, because it can be changed into a prime (20320007) 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, 81812 + ... + 82059.

It is an arithmetic number, because the mean of its divisors is an integer number (3058944).

Almost surely, 2^20320004 is an apocalyptic number.

It is an amenable number.

20320004 is a deficient number, since it is larger than the sum of its proper divisors (16387324).

20320004 is a wasteful number, since it uses less digits than its factorization.

20320004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163906 (or 163904 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 20320004 is about 4507.7715115121. The cubic root of 20320004 is about 272.8818158581.

Adding to 20320004 its reverse (40002302), we get a palindrome (60322306).

The spelling of 20320004 in words is "twenty million, three hundred twenty thousand, four".