20006304021 has 64 divisors (see below), whose sum is σ = 34964213760. Its totient is φ = 11168858880.

The previous prime is 20006304013. The next prime is 20006304067. The reversal of 20006304021 is 12040360002.

It is a happy number.

20006304021 is a `hidden beast` number, since 200 + 0 + 63 + 0 + 402 + 1 = 666.

It is not a de Polignac number, because 20006304021 - 2³ = 20006304013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20006303985 and 20006304003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006304001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 195150 + ... + 279456.

It is an arithmetic number, because the mean of its divisors is an integer number (546315840).

Almost surely, 2^20006304021 is an apocalyptic number.

It is an amenable number.

20006304021 is a deficient number, since it is larger than the sum of its proper divisors (14957909739).

20006304021 is a wasteful number, since it uses less digits than its factorization.

20006304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84391 (or 84385 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20006304021 its reverse (12040360002), we get a palindrome (32046664023).

The spelling of 20006304021 in words is "twenty billion, six million, three hundred four thousand, twenty-one".