20164849 has 4 divisors (see below), whose sum is σ = 20815360. Its totient is φ = 19514340.

The previous prime is 20164847. The next prime is 20164853. The reversal of 20164849 is 94846102.

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 20164849 - 2¹ = 20164847 is a prime.

It is a super-2 number, since 2×20164849² = 813242270385602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20164847) 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, 325209 + ... + 325270.

It is an arithmetic number, because the mean of its divisors is an integer number (5203840).

Almost surely, 2^20164849 is an apocalyptic number.

It is an amenable number.

20164849 is a deficient number, since it is larger than the sum of its proper divisors (650511).

20164849 is an equidigital number, since it uses as much as digits as its factorization.

20164849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650510.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20164849 is about 4490.5288107304. The cubic root of 20164849 is about 272.1855036843.

The spelling of 20164849 in words is "twenty million, one hundred sixty-four thousand, eight hundred forty-nine".