20782144 has 28 divisors (see below), whose sum is σ = 41500044. Its totient is φ = 10325504.

The previous prime is 20782141. The next prime is 20782159. The reversal of 20782144 is 44128702.

It can be written as a sum of positive squares in 2 ways, for example, as 16321600 + 4460544 = 4040^2 + 2112^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10134 + ... + 12010.

Almost surely, 2^20782144 is an apocalyptic number.

It is an amenable number.

20782144 is a deficient number, since it is larger than the sum of its proper divisors (20717900).

20782144 is a wasteful number, since it uses less digits than its factorization.

20782144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20782144 is about 4558.7436865873. The cubic root of 20782144 is about 274.9350546358.

The spelling of 20782144 in words is "twenty million, seven hundred eighty-two thousand, one hundred forty-four".