20543043 has 4 divisors (see below), whose sum is σ = 27390728. Its totient is φ = 13695360.

The previous prime is 20542999. The next prime is 20543051. The reversal of 20543043 is 34034502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20543043 - 2⁹ = 20542531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3423838 + ... + 3423843.

It is an arithmetic number, because the mean of its divisors is an integer number (6847682).

Almost surely, 2^20543043 is an apocalyptic number.

20543043 is a deficient number, since it is larger than the sum of its proper divisors (6847685).

20543043 is an equidigital number, since it uses as much as digits as its factorization.

20543043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6847684.

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20543043 is about 4532.4433807826. The cubic root of 20543043 is about 273.8765983114.

Adding to 20543043 its reverse (34034502), we get a palindrome (54577545).

The spelling of 20543043 in words is "twenty million, five hundred forty-three thousand, forty-three".