20579957 has 4 divisors (see below), whose sum is σ = 20645196. Its totient is φ = 20514720.

The previous prime is 20579947. The next prime is 20579959. The reversal of 20579957 is 75997502.

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 857476 + 19722481 = 926^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20579957 - 2⁸ = 20579701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20579959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32144 + ... + 32777.

It is an arithmetic number, because the mean of its divisors is an integer number (5161299).

Almost surely, 2^20579957 is an apocalyptic number.

It is an amenable number.

20579957 is a deficient number, since it is larger than the sum of its proper divisors (65239).

20579957 is an equidigital number, since it uses as much as digits as its factorization.

20579957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65238.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 20579957 is about 4536.5137495658. The cubic root of 20579957 is about 274.0405440208.

The spelling of 20579957 in words is "twenty million, five hundred seventy-nine thousand, nine hundred fifty-seven".