20205273091 has 2 divisors, whose sum is σ = 20205273092. Its totient is φ = 20205273090.

The previous prime is 20205273071. The next prime is 20205273133. The reversal of 20205273091 is 19037250202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20205273091 - 2⁹ = 20205272579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20205273071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102636545 + 10102636546.

It is an arithmetic number, because the mean of its divisors is an integer number (10102636546).

Almost surely, 2^20205273091 is an apocalyptic number.

20205273091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205273091 is an equidigital number, since it uses as much as digits as its factorization.

20205273091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 20205273091 in words is "twenty billion, two hundred five million, two hundred seventy-three thousand, ninety-one".