20682728123 has 2 divisors, whose sum is σ = 20682728124. Its totient is φ = 20682728122.

The previous prime is 20682728119. The next prime is 20682728153. The reversal of 20682728123 is 32182728602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20682728123 - 2² = 20682728119 is a prime.

It is not a weakly prime, because it can be changed into another prime (20682728153) 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 as a sum of consecutive naturals, namely, 10341364061 + 10341364062.

It is an arithmetic number, because the mean of its divisors is an integer number (10341364062).

Almost surely, 2^20682728123 is an apocalyptic number.

20682728123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20682728123 is an equidigital number, since it uses as much as digits as its factorization.

20682728123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 20682728123 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred twenty-three".