20056478 has 8 divisors (see below), whose sum is σ = 32398968. Its totient is φ = 9256824.

The previous prime is 20056471. The next prime is 20056499. The reversal of 20056478 is 87465002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20056471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385676 + ... + 385727.

It is an arithmetic number, because the mean of its divisors is an integer number (4049871).

Almost surely, 2^20056478 is an apocalyptic number.

20056478 is a deficient number, since it is larger than the sum of its proper divisors (12342490).

20056478 is a wasteful number, since it uses less digits than its factorization.

20056478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771418.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20056478 is about 4478.4459358130. The cubic root of 20056478 is about 271.6970296565.

The spelling of 20056478 in words is "twenty million, fifty-six thousand, four hundred seventy-eight".