20199091 has 8 divisors (see below), whose sum is σ = 22254768. Its totient is φ = 18180000.

The previous prime is 20199079. The next prime is 20199103. The reversal of 20199091 is 19099102.

It is an interprime number because it is at equal distance from previous prime (20199079) and next prime (20199103).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20199091 - 2⁵ = 20199059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20199041) 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 7 ways as a sum of consecutive naturals, for example, 7980 + ... + 10201.

It is an arithmetic number, because the mean of its divisors is an integer number (2781846).

Almost surely, 2^20199091 is an apocalyptic number.

20199091 is a deficient number, since it is larger than the sum of its proper divisors (2055677).

20199091 is a wasteful number, since it uses less digits than its factorization.

20199091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18293.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 20199091 is about 4494.3398847884. The cubic root of 20199091 is about 272.3394829421.

The spelling of 20199091 in words is "twenty million, one hundred ninety-nine thousand, ninety-one".