820686846 has 16 divisors (see below), whose sum is σ = 1875855744. Its totient is φ = 234481944.

The previous prime is 820686767. The next prime is 820686857. The reversal of 820686846 is 648686028.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 820686795 and 820686804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9770040 + ... + 9770123.

It is an arithmetic number, because the mean of its divisors is an integer number (117240984).

Almost surely, 2^820686846 is an apocalyptic number.

820686846 is an abundant number, since it is smaller than the sum of its proper divisors (1055168898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820686846 is a wasteful number, since it uses less digits than its factorization.

820686846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19540175.

The product of its (nonzero) digits is 884736, while the sum is 48.

The square root of 820686846 is about 28647.6324676229. The cubic root of 820686846 is about 936.2514231623.

The spelling of 820686846 in words is "eight hundred twenty million, six hundred eighty-six thousand, eight hundred forty-six".