20199673 has 4 divisors (see below), whose sum is σ = 21753508. Its totient is φ = 18645840.

The previous prime is 20199659. The next prime is 20199701. The reversal of 20199673 is 37699102.

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 2534464 + 17665209 = 1592^2 + 4203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20199673 - 2⁹ = 20199161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20199623) 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, 776898 + ... + 776923.

It is an arithmetic number, because the mean of its divisors is an integer number (5438377).

Almost surely, 2^20199673 is an apocalyptic number.

It is an amenable number.

20199673 is a deficient number, since it is larger than the sum of its proper divisors (1553835).

20199673 is a wasteful number, since it uses less digits than its factorization.

20199673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553834.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20199673 is about 4494.4046324291. The cubic root of 20199673 is about 272.3420985723.

The spelling of 20199673 in words is "twenty million, one hundred ninety-nine thousand, six hundred seventy-three".