20884213 has 4 divisors (see below), whose sum is σ = 23867680. Its totient is φ = 17900748.

The previous prime is 20884187. The next prime is 20884219. The reversal of 20884213 is 31248802.

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-20884213 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 (20884219) 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, 1491723 + ... + 1491736.

It is an arithmetic number, because the mean of its divisors is an integer number (5966920).

Almost surely, 2^20884213 is an apocalyptic number.

It is an amenable number.

20884213 is a deficient number, since it is larger than the sum of its proper divisors (2983467).

20884213 is an equidigital number, since it uses as much as digits as its factorization.

20884213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983466.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20884213 is about 4569.9248352681. The cubic root of 20884213 is about 275.3844232448.

The spelling of 20884213 in words is "twenty million, eight hundred eighty-four thousand, two hundred thirteen".