20682728177 has 2 divisors, whose sum is σ = 20682728178. Its totient is φ = 20682728176.

The previous prime is 20682728153. The next prime is 20682728233. The reversal of 20682728177 is 77182728602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14372173456 + 6310554721 = 119884^2 + 79439^2 .

It is a cyclic number.

It is not a de Polignac number, because 20682728177 - 2⁸ = 20682727921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20682728117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341364088 + 10341364089.

It is an arithmetic number, because the mean of its divisors is an integer number (10341364089).

Almost surely, 2^20682728177 is an apocalyptic number.

It is an amenable number.

20682728177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20682728177 is an equidigital number, since it uses as much as digits as its factorization.

20682728177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 20682728177 in words is "twenty billion, six hundred eighty-two million, seven hundred twenty-eight thousand, one hundred seventy-seven".