20682728117 has 2 divisors, whose sum is σ = 20682728118. Its totient is φ = 20682728116.

The previous prime is 20682728063. The next prime is 20682728119. The reversal of 20682728117 is 71182728602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14563421041 + 6119307076 = 120679^2 + 78226^2 .

It is a cyclic number.

It is not a de Polignac number, because 20682728117 - 2³² = 16387760821 is a prime.

Together with 20682728119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20682728119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341364058 + 10341364059.

It is an arithmetic number, because the mean of its divisors is an integer number (10341364059).

Almost surely, 2^20682728117 is an apocalyptic number.

It is an amenable number.

20682728117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20682728117 is an equidigital number, since it uses as much as digits as its factorization.

20682728117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 20682728117 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred seventeen".