20440904888 has 8 divisors (see below), whose sum is σ = 38326696680. Its totient is φ = 10220452440.

The previous prime is 20440904879. The next prime is 20440904909. The reversal of 20440904888 is 88840904402.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277556548 + ... + 1277556563.

It is an arithmetic number, because the mean of its divisors is an integer number (4790837085).

Almost surely, 2^20440904888 is an apocalyptic number.

It is an amenable number.

20440904888 is a deficient number, since it is larger than the sum of its proper divisors (17885791792).

20440904888 is a wasteful number, since it uses less digits than its factorization.

20440904888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555113117 (or 2555113113 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 20440904888 in words is "twenty billion, four hundred forty million, nine hundred four thousand, eight hundred eighty-eight".