20479873 has 4 divisors (see below), whose sum is σ = 20537280. Its totient is φ = 20422468.

The previous prime is 20479859. The next prime is 20479897. The reversal of 20479873 is 37897402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20479873 is a prime.

It is a super-2 number, since 2×20479873² = 838850396192258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20479813) 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, 28165 + ... + 28882.

It is an arithmetic number, because the mean of its divisors is an integer number (5134320).

Almost surely, 2^20479873 is an apocalyptic number.

It is an amenable number.

20479873 is a deficient number, since it is larger than the sum of its proper divisors (57407).

20479873 is an equidigital number, since it uses as much as digits as its factorization.

20479873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57406.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 20479873 is about 4525.4693679220. The cubic root of 20479873 is about 273.5955859282.

The spelling of 20479873 in words is "twenty million, four hundred seventy-nine thousand, eight hundred seventy-three".