20764788 has 48 divisors (see below), whose sum is σ = 53996544. Its totient is φ = 6156640.

The previous prime is 20764787. The next prime is 20764811. The reversal of 20764788 is 88746702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20764781) 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 15 ways as a sum of consecutive naturals, for example, 4531 + ... + 7877.

It is an arithmetic number, because the mean of its divisors is an integer number (1124928).

Almost surely, 2^20764788 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 20764788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998272).

20764788 is an abundant number, since it is smaller than the sum of its proper divisors (33231756).

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

20764788 is a wasteful number, since it uses less digits than its factorization.

20764788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3412 (or 3410 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 20764788 is about 4556.8396943496. The cubic root of 20764788 is about 274.8584968981.

The spelling of 20764788 in words is "twenty million, seven hundred sixty-four thousand, seven hundred eighty-eight".