20044004004 has 72 divisors (see below), whose sum is σ = 52135443360. Its totient is φ = 6489407232.

The previous prime is 20044003937. The next prime is 20044004011. The reversal of 20044004004 is 40040044002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240924 + ... + 313260.

It is an arithmetic number, because the mean of its divisors is an integer number (724103380).

Almost surely, 2^20044004004 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 20044004004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26067721680).

20044004004 is an abundant number, since it is smaller than the sum of its proper divisors (32091439356).

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

20044004004 is a wasteful number, since it uses less digits than its factorization.

20044004004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72569 (or 72564 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 20044004004 its reverse (40040044002), we get a palindrome (60084048006).

The spelling of 20044004004 in words is "twenty billion, forty-four million, four thousand, four".