20778082 has 16 divisors (see below), whose sum is σ = 33683832. Its totient is φ = 9555840.

The previous prime is 20778071. The next prime is 20778083. The reversal of 20778082 is 28087702.

It can be written as a sum of positive squares in 4 ways, for example, as 2193361 + 18584721 = 1481^2 + 4311^2 .

It is not an unprimeable number, because it can be changed into a prime (20778083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6982 + ... + 9502.

Almost surely, 2^20778082 is an apocalyptic number.

20778082 is a deficient number, since it is larger than the sum of its proper divisors (12905750).

20778082 is a wasteful number, since it uses less digits than its factorization.

20778082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 20778082 is about 4558.2981473353. The cubic root of 20778082 is about 274.9171408768.

The spelling of 20778082 in words is "twenty million, seven hundred seventy-eight thousand, eighty-two".