20204479 has 4 divisors (see below), whose sum is σ = 20750584. Its totient is φ = 19658376.

The previous prime is 20204477. The next prime is 20204519. The reversal of 20204479 is 97440202.

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 20204479 - 2¹ = 20204477 is a prime.

It is a super-2 number, since 2×20204479² = 816441943322882, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204477) 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, 272997 + ... + 273070.

It is an arithmetic number, because the mean of its divisors is an integer number (5187646).

Almost surely, 2^20204479 is an apocalyptic number.

20204479 is a deficient number, since it is larger than the sum of its proper divisors (546105).

20204479 is an equidigital number, since it uses as much as digits as its factorization.

20204479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546104.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20204479 is about 4494.9392654406. The cubic root of 20204479 is about 272.3636958251.

The spelling of 20204479 in words is "twenty million, two hundred four thousand, four hundred seventy-nine".