20967823 has 2 divisors, whose sum is σ = 20967824. Its totient is φ = 20967822.

The previous prime is 20967799. The next prime is 20967839. The reversal of 20967823 is 32876902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20967823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483911 + 10483912.

It is an arithmetic number, because the mean of its divisors is an integer number (10483912).

Almost surely, 2^20967823 is an apocalyptic number.

20967823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967823 is an equidigital number, since it uses as much as digits as its factorization.

20967823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20967823 is about 4579.0635505527. The cubic root of 20967823 is about 275.7514346496.

The spelling of 20967823 in words is "twenty million, nine hundred sixty-seven thousand, eight hundred twenty-three".