20236716557 has 4 divisors (see below), whose sum is σ = 20338408800. Its totient is φ = 20135024316.

The previous prime is 20236716553. The next prime is 20236716559. The reversal of 20236716557 is 75561763202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20236716557 - 2² = 20236716553 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 (20236716553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50845823 + ... + 50846220.

It is an arithmetic number, because the mean of its divisors is an integer number (5084602200).

Almost surely, 2^20236716557 is an apocalyptic number.

It is an amenable number.

20236716557 is a deficient number, since it is larger than the sum of its proper divisors (101692243).

20236716557 is a wasteful number, since it uses less digits than its factorization.

20236716557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101692242.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 20236716557 in words is "twenty billion, two hundred thirty-six million, seven hundred sixteen thousand, five hundred fifty-seven".