20008004 has 6 divisors (see below), whose sum is σ = 35014014. Its totient is φ = 10004000.

The previous prime is 20007979. The next prime is 20008019. The reversal of 20008004 is 40080002.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 4008004 = 4000^2 + 2002^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20008004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500997 + ... + 2501004.

It is an arithmetic number, because the mean of its divisors is an integer number (5835669).

Almost surely, 2^20008004 is an apocalyptic number.

It is an amenable number.

20008004 is a deficient number, since it is larger than the sum of its proper divisors (15006010).

20008004 is a wasteful number, since it uses less digits than its factorization.

20008004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002005 (or 5002003 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20008004 is about 4473.0307398899. The cubic root of 20008004 is about 271.4779671611.

Adding to 20008004 its reverse (40080002), we get a palindrome (60088006).

The spelling of 20008004 in words is "twenty million, eight thousand, four".