20004672 has 56 divisors (see below), whose sum is σ = 54652672. Its totient is φ = 6451200.

The previous prime is 20004667. The next prime is 20004683. The reversal of 20004672 is 27640002.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 4272 + ... + 7632.

Almost surely, 2^20004672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20004672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27326336).

20004672 is an abundant number, since it is smaller than the sum of its proper divisors (34648000).

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

20004672 is a wasteful number, since it uses less digits than its factorization.

20004672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407 (or 3397 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20004672 is about 4472.6582699777. The cubic root of 20004672 is about 271.4628962791.

Adding to 20004672 its reverse (27640002), we get a palindrome (47644674).

The spelling of 20004672 in words is "twenty million, four thousand, six hundred seventy-two".