820975803 has 16 divisors (see below), whose sum is σ = 1105125120. Its totient is φ = 542096864.

The previous prime is 820975789. The next prime is 820975811. The reversal of 820975803 is 308579028.

It is a cyclic number.

It is not a de Polignac number, because 820975803 - 2⁴ = 820975787 is a prime.

It is a super-2 number, since 2×820975803² = 1348002538222989618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (820975853) 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 15 ways as a sum of consecutive naturals, for example, 138325 + ... + 144137.

It is an arithmetic number, because the mean of its divisors is an integer number (69070320).

Almost surely, 2^820975803 is an apocalyptic number.

820975803 is a deficient number, since it is larger than the sum of its proper divisors (284149317).

820975803 is a wasteful number, since it uses less digits than its factorization.

820975803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6258.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 820975803 is about 28652.6753201163. The cubic root of 820975803 is about 936.3612923768.

The spelling of 820975803 in words is "eight hundred twenty million, nine hundred seventy-five thousand, eight hundred three".