20535544044 has 18 divisors (see below), whose sum is σ = 51909291980. Its totient is φ = 6845181336.

The previous prime is 20535544027. The next prime is 20535544067. The reversal of 20535544044 is 44044553502.

20535544044 is a `hidden beast` number, since 20 + 5 + 3 + 554 + 40 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 570431779 = 20535544044 / (2 + 0 + 5 + 3 + 5 + 5 + 4 + 4 + 0 + 4 + 4).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 285215854 + ... + 285215925.

Almost surely, 2^20535544044 is an apocalyptic number.

It is an amenable number.

20535544044 is an abundant number, since it is smaller than the sum of its proper divisors (31373747936).

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

20535544044 is a wasteful number, since it uses less digits than its factorization.

20535544044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570431789 (or 570431784 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 36.

The spelling of 20535544044 in words is "twenty billion, five hundred thirty-five million, five hundred forty-four thousand, forty-four".