20568479 has 4 divisors (see below), whose sum is σ = 20816376. Its totient is φ = 20320584.

The previous prime is 20568461. The next prime is 20568497. The reversal of 20568479 is 97486502.

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

It is an interprime number because it is at equal distance from previous prime (20568461) and next prime (20568497).

It is a cyclic number.

It is not a de Polignac number, because 20568479 - 2¹⁶ = 20502943 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 (20568679) 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, 123824 + ... + 123989.

It is an arithmetic number, because the mean of its divisors is an integer number (5204094).

Almost surely, 2^20568479 is an apocalyptic number.

20568479 is a deficient number, since it is larger than the sum of its proper divisors (247897).

20568479 is an equidigital number, since it uses as much as digits as its factorization.

20568479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247896.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20568479 is about 4535.2485047680. The cubic root of 20568479 is about 273.9895879326.

The spelling of 20568479 in words is "twenty million, five hundred sixty-eight thousand, four hundred seventy-nine".