19820747 has 2 divisors, whose sum is σ = 19820748. Its totient is φ = 19820746.

The previous prime is 19820737. The next prime is 19820777. The reversal of 19820747 is 74702891.

It is a weak prime.

It is an emirp because it is prime and its reverse (74702891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19820747 - 2⁶ = 19820683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19820747.

It is not a weakly prime, because it can be changed into another prime (19820737) 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, 9910373 + 9910374.

It is an arithmetic number, because the mean of its divisors is an integer number (9910374).

Almost surely, 2^19820747 is an apocalyptic number.

19820747 is a deficient number, since it is larger than the sum of its proper divisors (1).

19820747 is an equidigital number, since it uses as much as digits as its factorization.

19820747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 19820747 is about 4452.0497526420. The cubic root of 19820747 is about 270.6283809472.

The spelling of 19820747 in words is "nineteen million, eight hundred twenty thousand, seven hundred forty-seven".