820701731 has 4 divisors (see below), whose sum is σ = 826606200. Its totient is φ = 814797264.

The previous prime is 820701703. The next prime is 820701737. The reversal of 820701731 is 137107028.

820701731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820701731 - 2⁶ = 820701667 is a prime.

It is a super-2 number, since 2×820701731² = 1347102662532792722, 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 = 820701694 and 820701703.

It is not an unprimeable number, because it can be changed into a prime (820701737) 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, 2952026 + ... + 2952303.

It is an arithmetic number, because the mean of its divisors is an integer number (206651550).

Almost surely, 2^820701731 is an apocalyptic number.

820701731 is a deficient number, since it is larger than the sum of its proper divisors (5904469).

820701731 is a wasteful number, since it uses less digits than its factorization.

820701731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5904468.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 820701731 is about 28647.8922610373. The cubic root of 820701731 is about 936.2570834691.

Adding to 820701731 its reverse (137107028), we get a palindrome (957808759).

The spelling of 820701731 in words is "eight hundred twenty million, seven hundred one thousand, seven hundred thirty-one".