20199005 has 4 divisors (see below), whose sum is σ = 24238812. Its totient is φ = 16159200.

The previous prime is 20198999. The next prime is 20199007. The reversal of 20199005 is 50099102.

It is a happy number.

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 9156676 + 11042329 = 3026^2 + 3323^2 .

It is not a de Polignac number, because 20199005 - 2¹⁰ = 20197981 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 (20199007) 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, 2019896 + ... + 2019905.

It is an arithmetic number, because the mean of its divisors is an integer number (6059703).

Almost surely, 2^20199005 is an apocalyptic number.

It is an amenable number.

20199005 is a deficient number, since it is larger than the sum of its proper divisors (4039807).

20199005 is an equidigital number, since it uses as much as digits as its factorization.

20199005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039806.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 20199005 is about 4494.3303171885. The cubic root of 20199005 is about 272.3390964358.

The spelling of 20199005 in words is "twenty million, one hundred ninety-nine thousand, five".