20424479 has 4 divisors (see below), whose sum is σ = 20452080. Its totient is φ = 20396880.

The previous prime is 20424431. The next prime is 20424491. The reversal of 20424479 is 97442402.

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 20424479 - 2²⁴ = 3647263 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 (20424409) 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, 12659 + ... + 14180.

It is an arithmetic number, because the mean of its divisors is an integer number (5113020).

Almost surely, 2^20424479 is an apocalyptic number.

20424479 is a deficient number, since it is larger than the sum of its proper divisors (27601).

20424479 is an equidigital number, since it uses as much as digits as its factorization.

20424479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27600.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20424479 is about 4519.3449746617. The cubic root of 20424479 is about 273.3486892358.

The spelling of 20424479 in words is "twenty million, four hundred twenty-four thousand, four hundred seventy-nine".