20004006 has 16 divisors (see below), whose sum is σ = 43645248. Its totient is φ = 6061800.

The previous prime is 20004001. The next prime is 20004011. The reversal of 20004006 is 60040002.

20004006 is nontrivially palindromic in base 12.

It is an interprime number because it is at equal distance from previous prime (20004001) and next prime (20004011).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20003982 and 20004000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151480 + ... + 151611.

It is an arithmetic number, because the mean of its divisors is an integer number (2727828).

Almost surely, 2^20004006 is an apocalyptic number.

20004006 is an abundant number, since it is smaller than the sum of its proper divisors (23641242).

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

20004006 is a wasteful number, since it uses less digits than its factorization.

20004006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303107.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20004006 is about 4472.5838169899. The cubic root of 20004006 is about 271.4598837112.

Adding to 20004006 its reverse (60040002), we get a palindrome (80044008).

It can be divided in two parts, 2000 and 4006, that added together give a palindrome (6006).

The spelling of 20004006 in words is "twenty million, four thousand, six".