20782063 has 4 divisors (see below), whose sum is σ = 20987928. Its totient is φ = 20576200.

The previous prime is 20782061. The next prime is 20782081. The reversal of 20782063 is 36028702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20782063 - 2¹ = 20782061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20782061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102781 + ... + 102982.

It is an arithmetic number, because the mean of its divisors is an integer number (5246982).

Almost surely, 2^20782063 is an apocalyptic number.

20782063 is a deficient number, since it is larger than the sum of its proper divisors (205865).

20782063 is a wasteful number, since it uses less digits than its factorization.

20782063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205864.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20782063 is about 4558.7348025521. The cubic root of 20782063 is about 274.9346974419.

The spelling of 20782063 in words is "twenty million, seven hundred eighty-two thousand, sixty-three".