20775574784 has 18 divisors (see below), whose sum is σ = 41469995490. Its totient is φ = 10387787264.

The previous prime is 20775574783. The next prime is 20775574789. The reversal of 20775574784 is 48747557702.

It can be written as a sum of positive squares in only one way, i.e., 18084870400 + 2690704384 = 134480^2 + 51872^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775574783) 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 as a sum of consecutive naturals, namely, 40577039 + ... + 40577550.

Almost surely, 2^20775574784 is an apocalyptic number.

It is an amenable number.

20775574784 is a deficient number, since it is larger than the sum of its proper divisors (20694420706).

20775574784 is an frugal number, since it uses more digits than its factorization.

20775574784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81154605 (or 81154591 counting only the distinct ones).

The product of its (nonzero) digits is 15366400, while the sum is 56.

The spelling of 20775574784 in words is "twenty billion, seven hundred seventy-five million, five hundred seventy-four thousand, seven hundred eighty-four".