20044020021 has 48 divisors (see below), whose sum is σ = 28307268288. Its totient is φ = 12610740480.

The previous prime is 20044019971. The next prime is 20044020049. The reversal of 20044020021 is 12002044002.

It is not a de Polignac number, because 20044020021 - 2¹⁹ = 20043495733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20044020071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35601886 + ... + 35602448.

It is an arithmetic number, because the mean of its divisors is an integer number (589734756).

Almost surely, 2^20044020021 is an apocalyptic number.

It is an amenable number.

20044020021 is a deficient number, since it is larger than the sum of its proper divisors (8263248267).

20044020021 is a wasteful number, since it uses less digits than its factorization.

20044020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 20044020021 its reverse (12002044002), we get a palindrome (32046064023).

The spelling of 20044020021 in words is "twenty billion, forty-four million, twenty thousand, twenty-one".