20744213 has 4 divisors (see below), whose sum is σ = 23707680. Its totient is φ = 17780748.

The previous prime is 20744173. The next prime is 20744231. The reversal of 20744213 is 31244702.

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 20744213 - 2¹⁴ = 20727829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20744293) 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, 1481723 + ... + 1481736.

It is an arithmetic number, because the mean of its divisors is an integer number (5926920).

Almost surely, 2^20744213 is an apocalyptic number.

It is an amenable number.

20744213 is a deficient number, since it is larger than the sum of its proper divisors (2963467).

20744213 is an equidigital number, since it uses as much as digits as its factorization.

20744213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963466.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20744213 is about 4554.5815395050. The cubic root of 20744213 is about 274.7676847912.

Adding to 20744213 its reverse (31244702), we get a palindrome (51988915).

The spelling of 20744213 in words is "twenty million, seven hundred forty-four thousand, two hundred thirteen".