20203143 has 4 divisors (see below), whose sum is σ = 26937528. Its totient is φ = 13468760.

The previous prime is 20203133. The next prime is 20203151. The reversal of 20203143 is 34130202.

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 20203143 - 2⁹ = 20202631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3367188 + ... + 3367193.

It is an arithmetic number, because the mean of its divisors is an integer number (6734382).

Almost surely, 2^20203143 is an apocalyptic number.

20203143 is a deficient number, since it is larger than the sum of its proper divisors (6734385).

20203143 is an equidigital number, since it uses as much as digits as its factorization.

20203143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734384.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20203143 is about 4494.7906514097. The cubic root of 20203143 is about 272.3576924381.

Adding to 20203143 its reverse (34130202), we get a palindrome (54333345).

The spelling of 20203143 in words is "twenty million, two hundred three thousand, one hundred forty-three".