20813176091 has 2 divisors, whose sum is σ = 20813176092. Its totient is φ = 20813176090.

The previous prime is 20813176019. The next prime is 20813176121. The reversal of 20813176091 is 19067131802.

Together with previous prime (20813176019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20813176091 - 2¹⁰ = 20813175067 is a prime.

It is not a weakly prime, because it can be changed into another prime (20813176291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10406588045 + 10406588046.

It is an arithmetic number, because the mean of its divisors is an integer number (10406588046).

Almost surely, 2^20813176091 is an apocalyptic number.

20813176091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20813176091 is an equidigital number, since it uses as much as digits as its factorization.

20813176091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 20813176091 in words is "twenty billion, eight hundred thirteen million, one hundred seventy-six thousand, ninety-one".