20430043 has 4 divisors (see below), whose sum is σ = 20640760. Its totient is φ = 20219328.

The previous prime is 20430041. The next prime is 20430071. The reversal of 20430043 is 34003402.

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 20430043 - 2¹ = 20430041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20429999 and 20430026.

It is not an unprimeable number, because it can be changed into a prime (20430041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105213 + ... + 105406.

It is an arithmetic number, because the mean of its divisors is an integer number (5160190).

Almost surely, 2^20430043 is an apocalyptic number.

20430043 is a deficient number, since it is larger than the sum of its proper divisors (210717).

20430043 is an equidigital number, since it uses as much as digits as its factorization.

20430043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210716.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20430043 is about 4519.9605086770. The cubic root of 20430043 is about 273.3735087023.

Adding to 20430043 its reverse (34003402), we get a palindrome (54433445).

The spelling of 20430043 in words is "twenty million, four hundred thirty thousand, forty-three".