20163349 has 4 divisors (see below), whose sum is σ = 20655180. Its totient is φ = 19671520.

The previous prime is 20163331. The next prime is 20163359. The reversal of 20163349 is 94336102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 19298449 = 930^2 + 4393^2 .

It is a cyclic number.

It is not a de Polignac number, because 20163349 - 2⁵ = 20163317 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 (20163359) 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, 245854 + ... + 245935.

It is an arithmetic number, because the mean of its divisors is an integer number (5163795).

Almost surely, 2^20163349 is an apocalyptic number.

It is an amenable number.

20163349 is a deficient number, since it is larger than the sum of its proper divisors (491831).

20163349 is an equidigital number, since it uses as much as digits as its factorization.

20163349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491830.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20163349 is about 4490.3617894330. The cubic root of 20163349 is about 272.1787545077.

The spelling of 20163349 in words is "twenty million, one hundred sixty-three thousand, three hundred forty-nine".