20803091 has 2 divisors, whose sum is σ = 20803092. Its totient is φ = 20803090.

The previous prime is 20803067. The next prime is 20803129. The reversal of 20803091 is 19030802.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20803091 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20803021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10401545 + 10401546.

It is an arithmetic number, because the mean of its divisors is an integer number (10401546).

Almost surely, 2^20803091 is an apocalyptic number.

20803091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20803091 is an equidigital number, since it uses as much as digits as its factorization.

20803091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20803091 is about 4561.0405611001. The cubic root of 20803091 is about 275.0273956179.

Adding to 20803091 its reverse (19030802), we get a palindrome (39833893).

The spelling of 20803091 in words is "twenty million, eight hundred three thousand, ninety-one".