20091803 has 2 divisors, whose sum is σ = 20091804. Its totient is φ = 20091802.

The previous prime is 20091791. The next prime is 20091847. The reversal of 20091803 is 30819002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20091803 - 2⁴ = 20091787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20091853) 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 as a sum of consecutive naturals, namely, 10045901 + 10045902.

It is an arithmetic number, because the mean of its divisors is an integer number (10045902).

Almost surely, 2^20091803 is an apocalyptic number.

20091803 is a deficient number, since it is larger than the sum of its proper divisors (1).

20091803 is an equidigital number, since it uses as much as digits as its factorization.

20091803 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20091803 is about 4482.3880911853. The cubic root of 20091803 is about 271.8564472829.

The spelling of 20091803 in words is "twenty million, ninety-one thousand, eight hundred three".