20122831 has 2 divisors, whose sum is σ = 20122832. Its totient is φ = 20122830.

The previous prime is 20122829. The next prime is 20122853. The reversal of 20122831 is 13822102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20122831 - 2¹ = 20122829 is a prime.

It is a super-2 number, since 2×20122831² = 809856654909122, which contains 22 as substring.

Together with 20122829, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20122799 and 20122808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122871) 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 as a sum of consecutive naturals, namely, 10061415 + 10061416.

It is an arithmetic number, because the mean of its divisors is an integer number (10061416).

Almost surely, 2^20122831 is an apocalyptic number.

20122831 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122831 is an equidigital number, since it uses as much as digits as its factorization.

20122831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20122831 is about 4485.8478574290. The cubic root of 20122831 is about 271.9963189741.

Adding to 20122831 its reverse (13822102), we get a palindrome (33944933).

It can be divided in two parts, 201 and 22831, that added together give a palindrome (23032).

The spelling of 20122831 in words is "twenty million, one hundred twenty-two thousand, eight hundred thirty-one".