20803191 has 4 divisors (see below), whose sum is σ = 27737592. Its totient is φ = 13868792.

The previous prime is 20803183. The next prime is 20803199. The reversal of 20803191 is 19130802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20803183) and next prime (20803199).

It is a cyclic number.

It is not a de Polignac number, because 20803191 - 2³ = 20803183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20803199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3467196 + ... + 3467201.

It is an arithmetic number, because the mean of its divisors is an integer number (6934398).

Almost surely, 2^20803191 is an apocalyptic number.

20803191 is a deficient number, since it is larger than the sum of its proper divisors (6934401).

20803191 is an equidigital number, since it uses as much as digits as its factorization.

20803191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934400.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20803191 is about 4561.0515234976. The cubic root of 20803191 is about 275.0278363007.

Adding to 20803191 its reverse (19130802), we get a palindrome (39933993).

The spelling of 20803191 in words is "twenty million, eight hundred three thousand, one hundred ninety-one".