20782236 has 12 divisors (see below), whose sum is σ = 48491912. Its totient is φ = 6927408.

The previous prime is 20782231. The next prime is 20782243. The reversal of 20782236 is 63228702.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782231) 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 3 ways as a sum of consecutive naturals, for example, 865915 + ... + 865938.

Almost surely, 2^20782236 is an apocalyptic number.

It is an amenable number.

20782236 is an abundant number, since it is smaller than the sum of its proper divisors (27709676).

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

20782236 is a wasteful number, since it uses less digits than its factorization.

20782236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731860 (or 1731858 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20782236 is about 4558.7537770755. The cubic root of 20782236 is about 274.9354603365.

The spelling of 20782236 in words is "twenty million, seven hundred eighty-two thousand, two hundred thirty-six".