20256678 has 36 divisors (see below), whose sum is σ = 47532420. Its totient is φ = 6231888.

The previous prime is 20256659. The next prime is 20256689. The reversal of 20256678 is 87665202.

20256678 is a `hidden beast` number, since 20 + 2 + 566 + 78 = 666.

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 288 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (1320345).

Almost surely, 2^20256678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20256678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23766210).

20256678 is an abundant number, since it is smaller than the sum of its proper divisors (27275742).

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

20256678 is a wasteful number, since it uses less digits than its factorization.

20256678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6693 (or 6677 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 20256678 is about 4500.7419388363. The cubic root of 20256678 is about 272.5980479313.

The spelling of 20256678 in words is "twenty million, two hundred fifty-six thousand, six hundred seventy-eight".