20040143 has 4 divisors (see below), whose sum is σ = 20049288. Its totient is φ = 20031000.

The previous prime is 20040133. The next prime is 20040151. The reversal of 20040143 is 34104002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20040143 - 2²² = 15845839 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 (20040133) 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, 893 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (5012322).

Almost surely, 2^20040143 is an apocalyptic number.

20040143 is a deficient number, since it is larger than the sum of its proper divisors (9145).

20040143 is an equidigital number, since it uses as much as digits as its factorization.

20040143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9144.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20040143 is about 4476.6218290135. The cubic root of 20040143 is about 271.6232484005.

Adding to 20040143 its reverse (34104002), we get a palindrome (54144145).

The spelling of 20040143 in words is "twenty million, forty thousand, one hundred forty-three".