20192727281 has 2 divisors, whose sum is σ = 20192727282. Its totient is φ = 20192727280.

The previous prime is 20192727271. The next prime is 20192727283. The reversal of 20192727281 is 18272729102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17368867681 + 2823859600 = 131791^2 + 53140^2 .

It is a cyclic number.

It is not a de Polignac number, because 20192727281 - 2¹⁴ = 20192710897 is a prime.

It is a super-2 number, since 2×20192727281² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 20192727283, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20192727283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096363640 + 10096363641.

It is an arithmetic number, because the mean of its divisors is an integer number (10096363641).

Almost surely, 2^20192727281 is an apocalyptic number.

It is an amenable number.

20192727281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20192727281 is an equidigital number, since it uses as much as digits as its factorization.

20192727281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 20192727281 in words is "twenty billion, one hundred ninety-two million, seven hundred twenty-seven thousand, two hundred eighty-one".