20320199 has 4 divisors (see below), whose sum is σ = 20337864. Its totient is φ = 20302536.

The previous prime is 20320189. The next prime is 20320211. The reversal of 20320199 is 99102302.

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 20320199 - 2¹² = 20316103 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 (20320189) 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, 6977 + ... + 9450.

It is an arithmetic number, because the mean of its divisors is an integer number (5084466).

Almost surely, 2^20320199 is an apocalyptic number.

20320199 is a deficient number, since it is larger than the sum of its proper divisors (17665).

20320199 is a wasteful number, since it uses less digits than its factorization.

20320199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17664.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20320199 is about 4507.7931407730. The cubic root of 20320199 is about 272.8826887547.

It can be divided in two parts, 203 and 20199, that added together give a palindrome (20402).

The spelling of 20320199 in words is "twenty million, three hundred twenty thousand, one hundred ninety-nine".