19680823 has 2 divisors, whose sum is σ = 19680824. Its totient is φ = 19680822.

The previous prime is 19680769. The next prime is 19680841. The reversal of 19680823 is 32808691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19680823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19680863) 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, 9840411 + 9840412.

It is an arithmetic number, because the mean of its divisors is an integer number (9840412).

Almost surely, 2^19680823 is an apocalyptic number.

19680823 is a deficient number, since it is larger than the sum of its proper divisors (1).

19680823 is an equidigital number, since it uses as much as digits as its factorization.

19680823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 19680823 is about 4436.3073608577. The cubic root of 19680823 is about 269.9900453577.

It can be divided in two parts, 19680 and 823, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 19680823 in words is "nineteen million, six hundred eighty thousand, eight hundred twenty-three".