20849213 has 16 divisors (see below), whose sum is σ = 27363840. Its totient is φ = 15390000.

The previous prime is 20849207. The next prime is 20849237. The reversal of 20849213 is 31294802.

It is a de Polignac number, because none of the positive numbers 2^k-20849213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20849203) 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 15 ways as a sum of consecutive naturals, for example, 5663 + ... + 8588.

It is an arithmetic number, because the mean of its divisors is an integer number (1710240).

Almost surely, 2^20849213 is an apocalyptic number.

It is an amenable number.

20849213 is a deficient number, since it is larger than the sum of its proper divisors (6514627).

20849213 is a wasteful number, since it uses less digits than its factorization.

20849213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14288.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20849213 is about 4566.0938448525. The cubic root of 20849213 is about 275.2304976581.

The spelling of 20849213 in words is "twenty million, eight hundred forty-nine thousand, two hundred thirteen".