20599 has 2 divisors, whose sum is σ = 20600. Its totient is φ = 20598.

The previous prime is 20593. The next prime is 20611. The reversal of 20599 is 99502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10299 + 10300.

It is an arithmetic number, because the mean of its divisors is an integer number (10300).

2²⁰⁵⁹⁹ is an apocalyptic number.

20599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20599 is an equidigital number, since it uses as much as digits as its factorization.

20599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 20599 is about 143.5235172367. The cubic root of 20599 is about 27.4125042825.

The spelling of 20599 in words is "twenty thousand, five hundred ninety-nine".