20732713 has 4 divisors (see below), whose sum is σ = 20758788. Its totient is φ = 20706640.

The previous prime is 20732693. The next prime is 20732717. The reversal of 20732713 is 31723702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 6953769 = 3712^2 + 2637^2 .

It is a cyclic number.

It is not a de Polignac number, because 20732713 - 2¹³ = 20724521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20732717) 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, 11806 + ... + 13447.

It is an arithmetic number, because the mean of its divisors is an integer number (5189697).

Almost surely, 2^20732713 is an apocalyptic number.

It is an amenable number.

20732713 is a deficient number, since it is larger than the sum of its proper divisors (26075).

20732713 is an equidigital number, since it uses as much as digits as its factorization.

20732713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26074.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 20732713 is about 4553.3188994403. The cubic root of 20732713 is about 274.7169009499.

The spelling of 20732713 in words is "twenty million, seven hundred thirty-two thousand, seven hundred thirteen".