20440420004 has 12 divisors (see below), whose sum is σ = 35926940700. Its totient is φ = 10175579808.

The previous prime is 20440419973. The next prime is 20440420009. The reversal of 20440420004 is 40002404402.

It can be written as a sum of positive squares in 2 ways, for example, as 18266063104 + 2174356900 = 135152^2 + 46630^2 .

It is not an unprimeable number, because it can be changed into a prime (20440420009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11156519 + ... + 11158350.

It is an arithmetic number, because the mean of its divisors is an integer number (2993911725).

Almost surely, 2^20440420004 is an apocalyptic number.

It is an amenable number.

20440420004 is a deficient number, since it is larger than the sum of its proper divisors (15486520696).

20440420004 is a wasteful number, since it uses less digits than its factorization.

20440420004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22315102 (or 22315100 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20440420004 its reverse (40002404402), we get a palindrome (60442824406).

The spelling of 20440420004 in words is "twenty billion, four hundred forty million, four hundred twenty thousand, four".