20000678 has 4 divisors (see below), whose sum is σ = 30001020. Its totient is φ = 10000338.

The previous prime is 20000671. The next prime is 20000689. The reversal of 20000678 is 87600002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000671) 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 as a sum of consecutive naturals, namely, 5000168 + ... + 5000171.

It is an arithmetic number, because the mean of its divisors is an integer number (7500255).

Almost surely, 2^20000678 is an apocalyptic number.

20000678 is a deficient number, since it is larger than the sum of its proper divisors (10000342).

20000678 is a wasteful number, since it uses less digits than its factorization.

20000678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000341.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20000678 is about 4472.2117570616. The cubic root of 20000678 is about 271.4448289167. Note that the first 3 decimals are identical.

The spelling of 20000678 in words is "twenty million, six hundred seventy-eight", and thus it is an aban number.