20199089 has 4 divisors (see below), whose sum is σ = 20377956. Its totient is φ = 20020224.

The previous prime is 20199079. The next prime is 20199103. The reversal of 20199089 is 98099102.

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 547600 + 19651489 = 740^2 + 4433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20199089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20199029) 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, 89264 + ... + 89489.

It is an arithmetic number, because the mean of its divisors is an integer number (5094489).

Almost surely, 2^20199089 is an apocalyptic number.

It is an amenable number.

20199089 is a deficient number, since it is larger than the sum of its proper divisors (178867).

20199089 is a wasteful number, since it uses less digits than its factorization.

20199089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178866.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 20199089 is about 4494.3396622863. The cubic root of 20199089 is about 272.3394739536.

The spelling of 20199089 in words is "twenty million, one hundred ninety-nine thousand, eighty-nine".