20845678 has 24 divisors (see below), whose sum is σ = 36537912. Its totient is φ = 8893584.

The previous prime is 20845673. The next prime is 20845681. The reversal of 20845678 is 87654802.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20845678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20845673) 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, 33700 + ... + 34312.

It is an arithmetic number, because the mean of its divisors is an integer number (1522413).

Almost surely, 2^20845678 is an apocalyptic number.

20845678 is a deficient number, since it is larger than the sum of its proper divisors (15692234).

20845678 is a wasteful number, since it uses less digits than its factorization.

20845678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20845678 is about 4565.7067360925. The cubic root of 20845678 is about 275.2149415985.

The spelling of 20845678 in words is "twenty million, eight hundred forty-five thousand, six hundred seventy-eight".