20111143 has 8 divisors (see below), whose sum is σ = 22162448. Its totient is φ = 18131904.

The previous prime is 20111137. The next prime is 20111167. The reversal of 20111143 is 34111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20111143 - 2⁹ = 20110631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17430 + ... + 18547.

It is an arithmetic number, because the mean of its divisors is an integer number (2770306).

Almost surely, 2^20111143 is an apocalyptic number.

20111143 is a deficient number, since it is larger than the sum of its proper divisors (2051305).

20111143 is a wasteful number, since it uses less digits than its factorization.

20111143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36033.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 20111143 is about 4484.5449044468. The cubic root of 20111143 is about 271.9436473150.

Adding to 20111143 its reverse (34111102), we get a palindrome (54222245).

The spelling of 20111143 in words is "twenty million, one hundred eleven thousand, one hundred forty-three".