20764768 has 48 divisors (see below), whose sum is σ = 43273440. Its totient is φ = 9788416.

The previous prime is 20764763. The next prime is 20764771. The reversal of 20764768 is 86746702.

It is a self number, because there is not a number n which added to its sum of digits gives 20764768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764763) 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 7 ways as a sum of consecutive naturals, for example, 65346 + ... + 65662.

It is an arithmetic number, because the mean of its divisors is an integer number (901530).

Almost surely, 2^20764768 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 20764768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21636720).

20764768 is an abundant number, since it is smaller than the sum of its proper divisors (22508672).

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

20764768 is a wasteful number, since it uses less digits than its factorization.

20764768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 20764768 is about 4556.8374998457. The cubic root of 20764768 is about 274.8584086530.

The spelling of 20764768 in words is "twenty million, seven hundred sixty-four thousand, seven hundred sixty-eight".