20788544872 has 8 divisors (see below), whose sum is σ = 38978521650. Its totient is φ = 10394272432.

The previous prime is 20788544869. The next prime is 20788544873. The reversal of 20788544872 is 27844588702.

It can be written as a sum of positive squares in only one way, i.e., 12129497956 + 8659046916 = 110134^2 + 93054^2 .

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

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20788544873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1299284047 + ... + 1299284062.

Almost surely, 2^20788544872 is an apocalyptic number.

It is an amenable number.

20788544872 is a deficient number, since it is larger than the sum of its proper divisors (18189976778).

20788544872 is a wasteful number, since it uses less digits than its factorization.

20788544872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598568115 (or 2598568111 counting only the distinct ones).

The product of its (nonzero) digits is 8028160, while the sum is 55.

The spelling of 20788544872 in words is "twenty billion, seven hundred eighty-eight million, five hundred forty-four thousand, eight hundred seventy-two".