20786445 has 12 divisors (see below), whose sum is σ = 36029916. Its totient is φ = 11086080.

The previous prime is 20786443. The next prime is 20786449. The reversal of 20786445 is 54468702.

20786445 is a `hidden beast` number, since 2 + 0 + 7 + 8 + 644 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12595401 + 8191044 = 3549^2 + 2862^2 .

It is not a de Polignac number, because 20786445 - 2¹ = 20786443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786443) 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 11 ways as a sum of consecutive naturals, for example, 230916 + ... + 231005.

It is an arithmetic number, because the mean of its divisors is an integer number (3002493).

Almost surely, 2^20786445 is an apocalyptic number.

It is an amenable number.

20786445 is a deficient number, since it is larger than the sum of its proper divisors (15243471).

20786445 is a wasteful number, since it uses less digits than its factorization.

20786445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461932 (or 461929 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 20786445 is about 4559.2153930254. The cubic root of 20786445 is about 274.9540198607.

The spelling of 20786445 in words is "twenty million, seven hundred eighty-six thousand, four hundred forty-five".