20785812 has 48 divisors (see below), whose sum is σ = 49900032. Its totient is φ = 6732000.

The previous prime is 20785763. The next prime is 20785819. The reversal of 20785812 is 21858702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82687 + ... + 82937.

It is an arithmetic number, because the mean of its divisors is an integer number (1039584).

Almost surely, 2^20785812 is an apocalyptic number.

It is an amenable number.

20785812 is an abundant number, since it is smaller than the sum of its proper divisors (29114220).

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

20785812 is a wasteful number, since it uses less digits than its factorization.

20785812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20785812 is about 4559.1459726576. The cubic root of 20785812 is about 274.9512288165.

The spelling of 20785812 in words is "twenty million, seven hundred eighty-five thousand, eight hundred twelve".