20479305 has 96 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 7956480.

The previous prime is 20479297. The next prime is 20479331. The reversal of 20479305 is 50397402.

It is not a de Polignac number, because 20479305 - 2³ = 20479297 is a prime.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 137371 + ... + 137519.

It is an arithmetic number, because the mean of its divisors is an integer number (461700).

Almost surely, 2^20479305 is an apocalyptic number.

It is an amenable number.

20479305 is an abundant number, since it is smaller than the sum of its proper divisors (23843895).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20479305 is a wasteful number, since it uses less digits than its factorization.

20479305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20479305 is about 4525.4066115654. The cubic root of 20479305 is about 273.5930565549.

The spelling of 20479305 in words is "twenty million, four hundred seventy-nine thousand, three hundred five".