20785996 has 72 divisors (see below), whose sum is σ = 47803392. Its totient is φ = 7812000.

The previous prime is 20785993. The next prime is 20786021. The reversal of 20785996 is 69958702.

It is not an unprimeable number, because it can be changed into a prime (20785993) 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 23 ways as a sum of consecutive naturals, for example, 66681 + ... + 66991.

It is an arithmetic number, because the mean of its divisors is an integer number (663936).

Almost surely, 2^20785996 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 20785996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23901696).

20785996 is an abundant number, since it is smaller than the sum of its proper divisors (27017396).

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

20785996 is a wasteful number, since it uses less digits than its factorization.

20785996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20785996 is about 4559.1661518308. The cubic root of 20785996 is about 274.9520401212.

The spelling of 20785996 in words is "twenty million, seven hundred eighty-five thousand, nine hundred ninety-six".