20110000091 has 4 divisors (see below), whose sum is σ = 20803448400. Its totient is φ = 19416551784.

The previous prime is 20110000063. The next prime is 20110000109. The reversal of 20110000091 is 19000001102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20110000091 - 2¹⁰ = 20109999067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110000061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346724111 + ... + 346724168.

It is an arithmetic number, because the mean of its divisors is an integer number (5200862100).

Almost surely, 2^20110000091 is an apocalyptic number.

20110000091 is a deficient number, since it is larger than the sum of its proper divisors (693448309).

20110000091 is an equidigital number, since it uses as much as digits as its factorization.

20110000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693448308.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 20110000091 its reverse (19000001102), we get a palindrome (39110001193).

The spelling of 20110000091 in words is "twenty billion, one hundred ten million, ninety-one", and thus it is an aban number.