20599993 has 2 divisors, whose sum is σ = 20599994. Its totient is φ = 20599992.

The previous prime is 20599991. The next prime is 20600003. The reversal of 20599993 is 39999502.

It is a happy number.

20599993 is nontrivially palindromic in base 2.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 779689 = 4452^2 + 883^2 .

It is a cyclic number.

It is not a de Polignac number, because 20599993 - 2¹ = 20599991 is a prime.

Together with 20599991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20599991) 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, 10299996 + 10299997.

It is an arithmetic number, because the mean of its divisors is an integer number (10299997).

Almost surely, 2^20599993 is an apocalyptic number.

It is an amenable number.

20599993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20599993 is an equidigital number, since it uses as much as digits as its factorization.

20599993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196830, while the sum is 46.

The square root of 20599993 is about 4538.7215160219. The cubic root of 20599993 is about 274.1294475991.

The spelling of 20599993 in words is "twenty million, five hundred ninety-nine thousand, nine hundred ninety-three".