6820731 has 12 divisors (see below), whose sum is σ = 9904752. Its totient is φ = 4522896.

The previous prime is 6820727. The next prime is 6820733. The reversal of 6820731 is 1370286.

6820731 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6820731 - 2² = 6820727 is a prime.

It is a super-2 number, since 2×6820731² = 93044742748722, which contains 22 as substring.

6820731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6820695 and 6820704.

It is not an unprimeable number, because it can be changed into a prime (6820733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151 + ... + 3696.

It is an arithmetic number, because the mean of its divisors is an integer number (825396).

Almost surely, 2^6820731 is an apocalyptic number.

6820731 is a deficient number, since it is larger than the sum of its proper divisors (3084021).

6820731 is a wasteful number, since it uses less digits than its factorization.

6820731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4047 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 6820731 is about 2611.6529248734. The cubic root of 6820731 is about 189.6459797421.

The spelling of 6820731 in words is "six million, eight hundred twenty thousand, seven hundred thirty-one".