20678047 has 8 divisors (see below), whose sum is σ = 22304016. Its totient is φ = 19057152.

The previous prime is 20678027. The next prime is 20678059. The reversal of 20678047 is 74087602.

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 20678047 - 2⁷ = 20677919 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 (20678027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15168 + ... + 16474.

It is an arithmetic number, because the mean of its divisors is an integer number (2788002).

Almost surely, 2^20678047 is an apocalyptic number.

20678047 is a deficient number, since it is larger than the sum of its proper divisors (1625969).

20678047 is a wasteful number, since it uses less digits than its factorization.

20678047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20678047 is about 4547.3120631863. The cubic root of 20678047 is about 274.4752394988.

The spelling of 20678047 in words is "twenty million, six hundred seventy-eight thousand, forty-seven".