19920517927 has 2 divisors, whose sum is σ = 19920517928. Its totient is φ = 19920517926.

The previous prime is 19920517901. The next prime is 19920517957. The reversal of 19920517927 is 72971502991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19920517927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19920517957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960258963 + 9960258964.

It is an arithmetic number, because the mean of its divisors is an integer number (9960258964).

Almost surely, 2^19920517927 is an apocalyptic number.

19920517927 is a deficient number, since it is larger than the sum of its proper divisors (1).

19920517927 is an equidigital number, since it uses as much as digits as its factorization.

19920517927 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 714420, while the sum is 52.

The spelling of 19920517927 in words is "nineteen billion, nine hundred twenty million, five hundred seventeen thousand, nine hundred twenty-seven".