20430343 has 4 divisors (see below), whose sum is σ = 20776680. Its totient is φ = 20084008.

The previous prime is 20430323. The next prime is 20430349. The reversal of 20430343 is 34303402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20430343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20430343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430349) 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, 173080 + ... + 173197.

It is an arithmetic number, because the mean of its divisors is an integer number (5194170).

Almost surely, 2^20430343 is an apocalyptic number.

20430343 is a deficient number, since it is larger than the sum of its proper divisors (346337).

20430343 is an equidigital number, since it uses as much as digits as its factorization.

20430343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346336.

The product of its (nonzero) digits is 864, while the sum is 19.

The square root of 20430343 is about 4519.9936946859. The cubic root of 20430343 is about 273.3748467914.

Adding to 20430343 its reverse (34303402), we get a palindrome (54733745).

The spelling of 20430343 in words is "twenty million, four hundred thirty thousand, three hundred forty-three".