820894003 has 2 divisors, whose sum is σ = 820894004. Its totient is φ = 820894002.

The previous prime is 820893991. The next prime is 820894013. The reversal of 820894003 is 300498028.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820894003 is a prime.

It is a super-2 number, since 2×820894003² = 1347733928322728018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 820894003.

It is not a weakly prime, because it can be changed into another prime (820894013) 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, 410447001 + 410447002.

It is an arithmetic number, because the mean of its divisors is an integer number (410447002).

Almost surely, 2^820894003 is an apocalyptic number.

820894003 is a deficient number, since it is larger than the sum of its proper divisors (1).

820894003 is an equidigital number, since it uses as much as digits as its factorization.

820894003 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 820894003 is about 28651.2478436804. The cubic root of 820894003 is about 936.3301924356.

The spelling of 820894003 in words is "eight hundred twenty million, eight hundred ninety-four thousand, three".