20005199 has 4 divisors (see below), whose sum is σ = 20650560. Its totient is φ = 19359840.

The previous prime is 20005177. The next prime is 20005207. The reversal of 20005199 is 99150002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20005199 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 (20005129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322634 + ... + 322695.

It is an arithmetic number, because the mean of its divisors is an integer number (5162640).

Almost surely, 2^20005199 is an apocalyptic number.

20005199 is a deficient number, since it is larger than the sum of its proper divisors (645361).

20005199 is an equidigital number, since it uses as much as digits as its factorization.

20005199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645360.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 20005199 is about 4472.7171831002. The cubic root of 20005199 is about 271.4652800504.

The spelling of 20005199 in words is "twenty million, five thousand, one hundred ninety-nine".