20479965 has 16 divisors (see below), whose sum is σ = 35747136. Its totient is φ = 9929600.

The previous prime is 20479937. The next prime is 20479999. The reversal of 20479965 is 56997402.

It is not a de Polignac number, because 20479965 - 2⁸ = 20479709 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61896 + ... + 62225.

It is an arithmetic number, because the mean of its divisors is an integer number (2234196).

Almost surely, 2^20479965 is an apocalyptic number.

It is an amenable number.

20479965 is a deficient number, since it is larger than the sum of its proper divisors (15267171).

20479965 is a wasteful number, since it uses less digits than its factorization.

20479965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124140.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 20479965 is about 4525.4795326020. The cubic root of 20479965 is about 273.5959956110.

The spelling of 20479965 in words is "twenty million, four hundred seventy-nine thousand, nine hundred sixty-five".