20004020443 has 6 divisors (see below), whose sum is σ = 21987890372. Its totient is φ = 18185473020.

The previous prime is 20004020431. The next prime is 20004020467. The reversal of 20004020443 is 34402040002.

It is a de Polignac number, because none of the positive numbers 2^k-20004020443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004020443.

It is not an unprimeable number, because it can be changed into a prime (20004020243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82661121 + ... + 82661362.

Almost surely, 2^20004020443 is an apocalyptic number.

20004020443 is a deficient number, since it is larger than the sum of its proper divisors (1983869929).

20004020443 is a wasteful number, since it uses less digits than its factorization.

20004020443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165322505 (or 165322494 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

Adding to 20004020443 its reverse (34402040002), we get a palindrome (54406060445).

The spelling of 20004020443 in words is "twenty billion, four million, twenty thousand, four hundred forty-three".