20782664 has 24 divisors (see below), whose sum is σ = 45330390. Its totient is φ = 8906688.

The previous prime is 20782651. The next prime is 20782693. The reversal of 20782664 is 46628702.

It can be written as a sum of positive squares in only one way, i.e., 12545764 + 8236900 = 3542^2 + 2870^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26117 + ... + 26900.

Almost surely, 2^20782664 is an apocalyptic number.

It is an amenable number.

20782664 is an abundant number, since it is smaller than the sum of its proper divisors (24547726).

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

20782664 is a wasteful number, since it uses less digits than its factorization.

20782664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53037 (or 53026 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20782664 is about 4558.8007194875. The cubic root of 20782664 is about 274.9373477107.

The spelling of 20782664 in words is "twenty million, seven hundred eighty-two thousand, six hundred sixty-four".