20011120109 has 4 divisors (see below), whose sum is σ = 20285245116. Its totient is φ = 19736995104.

The previous prime is 20011120091. The next prime is 20011120159. The reversal of 20011120109 is 90102111002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90102111002 = 2 ⋅45051055501.

It can be written as a sum of positive squares in 2 ways, for example, as 14449242025 + 5561878084 = 120205^2 + 74578^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011120109 - 2³² = 15716152813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011120159) 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, 137062394 + ... + 137062539.

It is an arithmetic number, because the mean of its divisors is an integer number (5071311279).

Almost surely, 2^20011120109 is an apocalyptic number.

It is an amenable number.

20011120109 is a deficient number, since it is larger than the sum of its proper divisors (274125007).

20011120109 is an equidigital number, since it uses as much as digits as its factorization.

20011120109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274125006.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20011120109 in words is "twenty billion, eleven million, one hundred twenty thousand, one hundred nine".