20120831 has 4 divisors (see below), whose sum is σ = 20131752. Its totient is φ = 20109912.

The previous prime is 20120827. The next prime is 20120833. The reversal of 20120831 is 13802102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20120831 - 2² = 20120827 is a prime.

It is a super-2 number, since 2×20120831² = 809695680261122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120833) 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, 1940 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (5032938).

Almost surely, 2^20120831 is an apocalyptic number.

20120831 is a deficient number, since it is larger than the sum of its proper divisors (10921).

20120831 is an equidigital number, since it uses as much as digits as its factorization.

20120831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10920.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20120831 is about 4485.6249285913. The cubic root of 20120831 is about 271.9873074743.

Adding to 20120831 its reverse (13802102), we get a palindrome (33922933).

The spelling of 20120831 in words is "twenty million, one hundred twenty thousand, eight hundred thirty-one".