20430843 has 4 divisors (see below), whose sum is σ = 27241128. Its totient is φ = 13620560.

The previous prime is 20430841. The next prime is 20430857. The reversal of 20430843 is 34803402.

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 20430843 - 2¹ = 20430841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20430841) 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, 3405138 + ... + 3405143.

It is an arithmetic number, because the mean of its divisors is an integer number (6810282).

Almost surely, 2^20430843 is an apocalyptic number.

20430843 is a deficient number, since it is larger than the sum of its proper divisors (6810285).

20430843 is an equidigital number, since it uses as much as digits as its factorization.

20430843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810284.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20430843 is about 4520.0490041591. The cubic root of 20430843 is about 273.3770769107.

The spelling of 20430843 in words is "twenty million, four hundred thirty thousand, eight hundred forty-three".