20816349 has 4 divisors (see below), whose sum is σ = 27755136. Its totient is φ = 13877564.

The previous prime is 20816309. The next prime is 20816359. The reversal of 20816349 is 94361802.

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 20816349 - 2¹⁹ = 20292061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816309) 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, 3469389 + ... + 3469394.

It is an arithmetic number, because the mean of its divisors is an integer number (6938784).

Almost surely, 2^20816349 is an apocalyptic number.

It is an amenable number.

20816349 is a deficient number, since it is larger than the sum of its proper divisors (6938787).

20816349 is an equidigital number, since it uses as much as digits as its factorization.

20816349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938786.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20816349 is about 4562.4937260231. The cubic root of 20816349 is about 275.0858090346.

The spelling of 20816349 in words is "twenty million, eight hundred sixteen thousand, three hundred forty-nine".