20055216717 has 6 divisors (see below), whose sum is σ = 28968646382. Its totient is φ = 13370144472.

The previous prime is 20055216653. The next prime is 20055216719. The reversal of 20055216717 is 71761255002.

20055216717 is a `hidden beast` number, since 20 + 0 + 552 + 16 + 71 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10432783881 + 9622432836 = 102141^2 + 98094^2 .

It is not a de Polignac number, because 20055216717 - 2⁶ = 20055216653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20055216719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1114178698 + ... + 1114178715.

Almost surely, 2^20055216717 is an apocalyptic number.

It is an amenable number.

20055216717 is a deficient number, since it is larger than the sum of its proper divisors (8913429665).

20055216717 is a wasteful number, since it uses less digits than its factorization.

20055216717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228357419 (or 2228357416 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The spelling of 20055216717 in words is "twenty billion, fifty-five million, two hundred sixteen thousand, seven hundred seventeen".