20678861 has 8 divisors (see below), whose sum is σ = 23710080. Its totient is φ = 17666928.

The previous prime is 20678857. The next prime is 20678873. The reversal of 20678861 is 16887602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20678861 - 2² = 20678857 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 (20678831) 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 7 ways as a sum of consecutive naturals, for example, 2441 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (2963760).

Almost surely, 2^20678861 is an apocalyptic number.

It is an amenable number.

20678861 is a deficient number, since it is larger than the sum of its proper divisors (3031219).

20678861 is an equidigital number, since it uses as much as digits as its factorization.

20678861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20678861 is about 4547.4015657296. The cubic root of 20678861 is about 274.4788410626.

The spelling of 20678861 in words is "twenty million, six hundred seventy-eight thousand, eight hundred sixty-one".