20424213 has 12 divisors (see below), whose sum is σ = 29942848. Its totient is φ = 13412520.

The previous prime is 20424199. The next prime is 20424247. The reversal of 20424213 is 31242402.

It is not a de Polignac number, because 20424213 - 2⁴ = 20424197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16333 + ... + 17538.

Almost surely, 2^20424213 is an apocalyptic number.

It is an amenable number.

20424213 is a deficient number, since it is larger than the sum of its proper divisors (9518635).

20424213 is a wasteful number, since it uses less digits than its factorization.

20424213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33944 (or 33941 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20424213 is about 4519.3155455224. The cubic root of 20424213 is about 273.3475025704.

Adding to 20424213 its reverse (31242402), we get a palindrome (51666615).

The spelling of 20424213 in words is "twenty million, four hundred twenty-four thousand, two hundred thirteen".