20256199 has 4 divisors (see below), whose sum is σ = 20313936. Its totient is φ = 20198464.

The previous prime is 20256161. The next prime is 20256217. The reversal of 20256199 is 99165202.

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

It is a cyclic number.

It is not a de Polignac number, because 20256199 - 2¹⁹ = 19731911 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 (20256149) 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, 28339 + ... + 29044.

It is an arithmetic number, because the mean of its divisors is an integer number (5078484).

Almost surely, 2^20256199 is an apocalyptic number.

20256199 is a deficient number, since it is larger than the sum of its proper divisors (57737).

20256199 is an equidigital number, since it uses as much as digits as its factorization.

20256199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57736.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20256199 is about 4500.6887250731. The cubic root of 20256199 is about 272.5958992491.

The spelling of 20256199 in words is "twenty million, two hundred fifty-six thousand, one hundred ninety-nine".