20243155111 has 4 divisors (see below), whose sum is σ = 20257814824. Its totient is φ = 20228495400.

The previous prime is 20243155103. The next prime is 20243155129. The reversal of 20243155111 is 11155134202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11155134202 = 2 ⋅5577567101.

It is a cyclic number.

It is not a de Polignac number, because 20243155111 - 2³ = 20243155103 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 (20243155811) 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, 7327785 + ... + 7330546.

It is an arithmetic number, because the mean of its divisors is an integer number (5064453706).

Almost surely, 2^20243155111 is an apocalyptic number.

20243155111 is a deficient number, since it is larger than the sum of its proper divisors (14659713).

20243155111 is a wasteful number, since it uses less digits than its factorization.

20243155111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659712.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20243155111 its reverse (11155134202), we get a palindrome (31398289313).

The spelling of 20243155111 in words is "twenty billion, two hundred forty-three million, one hundred fifty-five thousand, one hundred eleven".