20716259 has 4 divisors (see below), whose sum is σ = 20767320. Its totient is φ = 20665200.

The previous prime is 20716253. The next prime is 20716273. The reversal of 20716259 is 95261702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20716259 - 2⁴ = 20716243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20716253) 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 in 3 ways as a sum of consecutive naturals, for example, 24917 + ... + 25734.

It is an arithmetic number, because the mean of its divisors is an integer number (5191830).

Almost surely, 2^20716259 is an apocalyptic number.

20716259 is a deficient number, since it is larger than the sum of its proper divisors (51061).

20716259 is an equidigital number, since it uses as much as digits as its factorization.

20716259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51060.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 20716259 is about 4551.5117268881. The cubic root of 20716259 is about 274.6442076464.

The spelling of 20716259 in words is "twenty million, seven hundred sixteen thousand, two hundred fifty-nine".