20143111 has 4 divisors (see below), whose sum is σ = 20186712. Its totient is φ = 20099512.

The previous prime is 20143099. The next prime is 20143129. The reversal of 20143111 is 11134102.

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 20143111 - 2¹¹ = 20141063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20143091 and 20143100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143171) 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, 21100 + ... + 22033.

It is an arithmetic number, because the mean of its divisors is an integer number (5046678).

Almost surely, 2^20143111 is an apocalyptic number.

20143111 is a deficient number, since it is larger than the sum of its proper divisors (43601).

20143111 is an equidigital number, since it uses as much as digits as its factorization.

20143111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43600.

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

The square root of 20143111 is about 4488.1077304361. The cubic root of 20143111 is about 272.0876618759.

Adding to 20143111 its reverse (11134102), we get a palindrome (31277213).

Subtracting from 20143111 its reverse (11134102), we obtain a palindrome (9009009).

The spelling of 20143111 in words is "twenty million, one hundred forty-three thousand, one hundred eleven".