20256768 has 144 divisors (see below), whose sum is σ = 67289040. Its totient is φ = 5750784.

The previous prime is 20256763. The next prime is 20256811. The reversal of 20256768 is 86765202.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128946 + ... + 129102.

It is an arithmetic number, because the mean of its divisors is an integer number (467285).

Almost surely, 2^20256768 is an apocalyptic number.

20256768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20256768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33644520).

20256768 is an abundant number, since it is smaller than the sum of its proper divisors (47032272).

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

20256768 is a wasteful number, since it uses less digits than its factorization.

20256768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 169 counting only the distinct ones).

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

The square root of 20256768 is about 4500.7519371767. The cubic root of 20256768 is about 272.5984516466.

The spelling of 20256768 in words is "twenty million, two hundred fifty-six thousand, seven hundred sixty-eight".