20804983 has 2 divisors, whose sum is σ = 20804984. Its totient is φ = 20804982.

The previous prime is 20804969. The next prime is 20805011. The reversal of 20804983 is 38940802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20804983 - 2⁵ = 20804951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20804933) 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 as a sum of consecutive naturals, namely, 10402491 + 10402492.

It is an arithmetic number, because the mean of its divisors is an integer number (10402492).

Almost surely, 2^20804983 is an apocalyptic number.

20804983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20804983 is an equidigital number, since it uses as much as digits as its factorization.

20804983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20804983 is about 4561.2479651955. The cubic root of 20804983 is about 275.0357330977.

The spelling of 20804983 in words is "twenty million, eight hundred four thousand, nine hundred eighty-three".