20910806011 has 2 divisors, whose sum is σ = 20910806012. Its totient is φ = 20910806010.

The previous prime is 20910805921. The next prime is 20910806029. The reversal of 20910806011 is 11060801902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20910806011 - 2²⁵ = 20877251579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20910800011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455403005 + 10455403006.

It is an arithmetic number, because the mean of its divisors is an integer number (10455403006).

Almost surely, 2^20910806011 is an apocalyptic number.

20910806011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910806011 is an equidigital number, since it uses as much as digits as its factorization.

20910806011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 20910806011 in words is "twenty billion, nine hundred ten million, eight hundred six thousand, eleven".