20430223 has 4 divisors (see below), whose sum is σ = 22287528. Its totient is φ = 18572920.

The previous prime is 20430191. The next prime is 20430251. The reversal of 20430223 is 32203402.

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 20430223 - 2⁵ = 20430191 is a prime.

It is a super-4 number, since 4×20430223⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20430197 and 20430206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430323) 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, 928636 + ... + 928657.

It is an arithmetic number, because the mean of its divisors is an integer number (5571882).

Almost surely, 2^20430223 is an apocalyptic number.

20430223 is a deficient number, since it is larger than the sum of its proper divisors (1857305).

20430223 is a wasteful number, since it uses less digits than its factorization.

20430223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857304.

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

The square root of 20430223 is about 4519.9804203116. The cubic root of 20430223 is about 273.3743115573.

Adding to 20430223 its reverse (32203402), we get a palindrome (52633625).

The spelling of 20430223 in words is "twenty million, four hundred thirty thousand, two hundred twenty-three".