820676231 has 4 divisors (see below), whose sum is σ = 824260200. Its totient is φ = 817092264.

The previous prime is 820676201. The next prime is 820676251. The reversal of 820676231 is 132676028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820676231 is a prime.

It is a super-2 number, since 2×820676231² = 1347018952256730722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820676191 and 820676200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820676201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1791641 + ... + 1792098.

It is an arithmetic number, because the mean of its divisors is an integer number (206065050).

Almost surely, 2^820676231 is an apocalyptic number.

820676231 is a deficient number, since it is larger than the sum of its proper divisors (3583969).

820676231 is a wasteful number, since it uses less digits than its factorization.

820676231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583968.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 820676231 is about 28647.4471986598. The cubic root of 820676231 is about 936.2473865630.

The spelling of 820676231 in words is "eight hundred twenty million, six hundred seventy-six thousand, two hundred thirty-one".