20956678 has 8 divisors (see below), whose sum is σ = 31462200. Its totient is φ = 10469280.

The previous prime is 20956673. The next prime is 20956679. The reversal of 20956678 is 87665902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20956673) 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, 1128 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (3932775).

Almost surely, 2^20956678 is an apocalyptic number.

20956678 is a deficient number, since it is larger than the sum of its proper divisors (10505522).

20956678 is a wasteful number, since it uses less digits than its factorization.

20956678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9062.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 20956678 is about 4577.8464369177. The cubic root of 20956678 is about 275.7025693890.

The spelling of 20956678 in words is "twenty million, nine hundred fifty-six thousand, six hundred seventy-eight".