20782812 has 24 divisors (see below), whose sum is σ = 48941200. Its totient is φ = 6863616.

The previous prime is 20782807. The next prime is 20782829. The reversal of 20782812 is 21828702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20782812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6637 + ... + 9252.

Almost surely, 2^20782812 is an apocalyptic number.

It is an amenable number.

20782812 is an abundant number, since it is smaller than the sum of its proper divisors (28158388).

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

20782812 is a wasteful number, since it uses less digits than its factorization.

20782812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16005 (or 16003 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 20782812 is about 4558.8169517979. The cubic root of 20782812 is about 274.9380003481.

The spelling of 20782812 in words is "twenty million, seven hundred eighty-two thousand, eight hundred twelve".