20782193 has 2 divisors, whose sum is σ = 20782194. Its totient is φ = 20782192.

The previous prime is 20782189. The next prime is 20782213. The reversal of 20782193 is 39128702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15547249 + 5234944 = 3943^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 20782193 - 2² = 20782189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20782103) 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, 10391096 + 10391097.

It is an arithmetic number, because the mean of its divisors is an integer number (10391097).

Almost surely, 2^20782193 is an apocalyptic number.

It is an amenable number.

20782193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20782193 is an equidigital number, since it uses as much as digits as its factorization.

20782193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20782193 is about 4558.7490608719. The cubic root of 20782193 is about 274.9352707157.

The spelling of 20782193 in words is "twenty million, seven hundred eighty-two thousand, one hundred ninety-three".