20181927071 has 2 divisors, whose sum is σ = 20181927072. Its totient is φ = 20181927070.

The previous prime is 20181927023. The next prime is 20181927079. The reversal of 20181927071 is 17072918102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20181927071 - 2¹⁰ = 20181926047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20181927079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10090963535 + 10090963536.

It is an arithmetic number, because the mean of its divisors is an integer number (10090963536).

Almost surely, 2^20181927071 is an apocalyptic number.

20181927071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20181927071 is an equidigital number, since it uses as much as digits as its factorization.

20181927071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 38.

The spelling of 20181927071 in words is "twenty billion, one hundred eighty-one million, nine hundred twenty-seven thousand, seventy-one".