20591713 has 4 divisors (see below), whose sum is σ = 20899120. Its totient is φ = 20284308.

The previous prime is 20591707. The next prime is 20591723. The reversal of 20591713 is 31719502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31719502 = 2 ⋅15859751.

It is a cyclic number.

It is not a de Polignac number, because 20591713 - 2⁹ = 20591201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20591723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153603 + ... + 153736.

It is an arithmetic number, because the mean of its divisors is an integer number (5224780).

Almost surely, 2^20591713 is an apocalyptic number.

It is an amenable number.

20591713 is a deficient number, since it is larger than the sum of its proper divisors (307407).

20591713 is an equidigital number, since it uses as much as digits as its factorization.

20591713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307406.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20591713 is about 4537.8092732066. The cubic root of 20591713 is about 274.0927146416.

The spelling of 20591713 in words is "twenty million, five hundred ninety-one thousand, seven hundred thirteen".