20430213 has 4 divisors (see below), whose sum is σ = 27240288. Its totient is φ = 13620140.

The previous prime is 20430191. The next prime is 20430251. The reversal of 20430213 is 31203402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20430213 - 2¹³ = 20422021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20430192 and 20430201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430713) 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, 3405033 + ... + 3405038.

It is an arithmetic number, because the mean of its divisors is an integer number (6810072).

Almost surely, 2^20430213 is an apocalyptic number.

It is an amenable number.

20430213 is a deficient number, since it is larger than the sum of its proper divisors (6810075).

20430213 is an equidigital number, since it uses as much as digits as its factorization.

20430213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810074.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20430213 is about 4519.9793141120. The cubic root of 20430213 is about 273.3742669544.

Adding to 20430213 its reverse (31203402), we get a palindrome (51633615).

The spelling of 20430213 in words is "twenty million, four hundred thirty thousand, two hundred thirteen".