920831 has 4 divisors (see below), whose sum is σ = 924672. Its totient is φ = 916992.

The previous prime is 920827. The next prime is 920833. The reversal of 920831 is 138029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138029 = 83 ⋅1663.

It is a cyclic number.

It is not a de Polignac number, because 920831 - 2² = 920827 is a prime.

It is a super-2 number, since 2×920831² = 1695859461122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 920797 and 920806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (231168).

2⁹²⁰⁸³¹ is an apocalyptic number.

920831 is a deficient number, since it is larger than the sum of its proper divisors (3841).

920831 is a wasteful number, since it uses less digits than its factorization.

920831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 920831 is about 959.5993955813. The cubic root of 920831 is about 97.2881571904.

The spelling of 920831 in words is "nine hundred twenty thousand, eight hundred thirty-one".