820855803 has 8 divisors (see below), whose sum is σ = 1152078400. Its totient is φ = 518435208.

The previous prime is 820855771. The next prime is 820855813. The reversal of 820855803 is 308558028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 820855803 - 2⁵ = 820855771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820855813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7200433 + ... + 7200546.

It is an arithmetic number, because the mean of its divisors is an integer number (144009800).

Almost surely, 2^820855803 is an apocalyptic number.

820855803 is a deficient number, since it is larger than the sum of its proper divisors (331222597).

820855803 is a wasteful number, since it uses less digits than its factorization.

820855803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14401001.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 820855803 is about 28650.5811982933. The cubic root of 820855803 is about 936.3156682834.

The spelling of 820855803 in words is "eight hundred twenty million, eight hundred fifty-five thousand, eight hundred three".