20202543 has 12 divisors (see below), whose sum is σ = 29268720. Its totient is φ = 13428096.

The previous prime is 20202517. The next prime is 20202557. The reversal of 20202543 is 34520202.

It is not a de Polignac number, because 20202543 - 2⁹ = 20202031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202503) 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 11 ways as a sum of consecutive naturals, for example, 3 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (2439060).

Almost surely, 2^20202543 is an apocalyptic number.

20202543 is a deficient number, since it is larger than the sum of its proper divisors (9066177).

20202543 is a wasteful number, since it uses less digits than its factorization.

20202543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718 (or 6715 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20202543 is about 4494.7239069825. The cubic root of 20202543 is about 272.3549962201.

Adding to 20202543 its reverse (34520202), we get a palindrome (54722745).

The spelling of 20202543 in words is "twenty million, two hundred two thousand, five hundred forty-three".