20803161 has 4 divisors (see below), whose sum is σ = 27737552. Its totient is φ = 13868772.

The previous prime is 20803141. The next prime is 20803163. The reversal of 20803161 is 16130802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20803161 - 2⁵ = 20803129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20803163) 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, 3467191 + ... + 3467196.

It is an arithmetic number, because the mean of its divisors is an integer number (6934388).

Almost surely, 2^20803161 is an apocalyptic number.

It is an amenable number.

20803161 is a deficient number, since it is larger than the sum of its proper divisors (6934391).

20803161 is an equidigital number, since it uses as much as digits as its factorization.

20803161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6934390.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20803161 is about 4561.0482347811. The cubic root of 20803161 is about 275.0277040960.

Adding to 20803161 its reverse (16130802), we get a palindrome (36933963).

The spelling of 20803161 in words is "twenty million, eight hundred three thousand, one hundred sixty-one".