20550745772 has 6 divisors (see below), whose sum is σ = 35963805108. Its totient is φ = 10275372884.

The previous prime is 20550745771. The next prime is 20550745811. The reversal of 20550745772 is 27754705502.

It is not an unprimeable number, because it can be changed into a prime (20550745771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2568843218 + ... + 2568843225.

It is an arithmetic number, because the mean of its divisors is an integer number (5993967518).

Almost surely, 2^20550745772 is an apocalyptic number.

It is an amenable number.

20550745772 is a deficient number, since it is larger than the sum of its proper divisors (15413059336).

20550745772 is a wasteful number, since it uses less digits than its factorization.

20550745772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137686447 (or 5137686445 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 44.

The spelling of 20550745772 in words is "twenty billion, five hundred fifty million, seven hundred forty-five thousand, seven hundred seventy-two".