20909000291 has 2 divisors, whose sum is σ = 20909000292. Its totient is φ = 20909000290.

The previous prime is 20909000257. The next prime is 20909000327. The reversal of 20909000291 is 19200090902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20909000291 - 2³⁰ = 19835258467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20909000201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454500145 + 10454500146.

It is an arithmetic number, because the mean of its divisors is an integer number (10454500146).

Almost surely, 2^20909000291 is an apocalyptic number.

20909000291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20909000291 is an equidigital number, since it uses as much as digits as its factorization.

20909000291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 20909000291 in words is "twenty billion, nine hundred nine million, two hundred ninety-one", and thus it is an aban number.