20042213 has 4 divisors (see below), whose sum is σ = 20688768. Its totient is φ = 19395660.

The previous prime is 20042173. The next prime is 20042249. The reversal of 20042213 is 31224002.

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 a de Polignac number, because none of the positive numbers 2^k-20042213 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 (20042263) 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 3 ways as a sum of consecutive naturals, for example, 323231 + ... + 323292.

It is an arithmetic number, because the mean of its divisors is an integer number (5172192).

Almost surely, 2^20042213 is an apocalyptic number.

It is an amenable number.

20042213 is a deficient number, since it is larger than the sum of its proper divisors (646555).

20042213 is an equidigital number, since it uses as much as digits as its factorization.

20042213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646554.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20042213 is about 4476.8530241678. The cubic root of 20042213 is about 271.6326003093.

Adding to 20042213 its reverse (31224002), we get a palindrome (51266215).

The spelling of 20042213 in words is "twenty million, forty-two thousand, two hundred thirteen".