20311011109 has 4 divisors (see below), whose sum is σ = 20597081760. Its totient is φ = 20024940460.

The previous prime is 20311011053. The next prime is 20311011157. The reversal of 20311011109 is 90111011302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20311011109 - 2¹³ = 20311002917 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 (20311011169) 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, 143035219 + ... + 143035360.

It is an arithmetic number, because the mean of its divisors is an integer number (5149270440).

Almost surely, 2^20311011109 is an apocalyptic number.

It is an amenable number.

20311011109 is a deficient number, since it is larger than the sum of its proper divisors (286070651).

20311011109 is an equidigital number, since it uses as much as digits as its factorization.

20311011109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286070650.

The product of its (nonzero) digits is 54, while the sum is 19.

The spelling of 20311011109 in words is "twenty billion, three hundred eleven million, eleven thousand, one hundred nine".