20831323 has 2 divisors, whose sum is σ = 20831324.
Its totient is φ = 20831322.
The previous prime is 20831299. The next prime is 20831533. The reversal of 20831323 is 32313802.
It is a happy number.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-20831323 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 20831294 and 20831303.
It is not a weakly prime, because it can be changed into another prime (20834323) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415661 + 10415662.
It is an arithmetic number, because the mean of its divisors is an integer number (10415662).
Almost surely, 220831323 is an apocalyptic number.
20831323 is a deficient number, since it is larger than the sum of its proper divisors (1).
20831323 is an equidigital number, since it uses as much as digits as its factorization.
20831323 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 864, while the sum is 22.
The square root of 20831323 is about 4564.1344195806.
The cubic root of 20831323 is about 275.1517531573.
The spelling of 20831323 in words is "twenty million, eight hundred thirty-one thousand, three hundred twenty-three".