20775768 has 64 divisors (see below), whose sum is σ = 59240160. Its totient is φ = 6014976.

The previous prime is 20775767. The next prime is 20775779. The reversal of 20775768 is 86757702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775761) 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 15 ways as a sum of consecutive naturals, for example, 3346 + ... + 7262.

Almost surely, 2^20775768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20775768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29620080).

20775768 is an abundant number, since it is smaller than the sum of its proper divisors (38464392).

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

20775768 is a wasteful number, since it uses less digits than its factorization.

20775768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3956 (or 3952 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 20775768 is about 4558.0443174677. The cubic root of 20775768 is about 274.9069348998.

The spelling of 20775768 in words is "twenty million, seven hundred seventy-five thousand, seven hundred sixty-eight".