20678671 has 12 divisors (see below), whose sum is σ = 23003832. Its totient is φ = 18566496.

The previous prime is 20678659. The next prime is 20678677. The reversal of 20678671 is 17687602.

It is a happy number.

It is not a de Polignac number, because 20678671 - 2⁹ = 20678159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20678671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4600 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (1916986).

Almost surely, 2^20678671 is an apocalyptic number.

20678671 is a deficient number, since it is larger than the sum of its proper divisors (2325161).

20678671 is a wasteful number, since it uses less digits than its factorization.

20678671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3357 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20678671 is about 4547.3806746302. The cubic root of 20678671 is about 274.4780004112.

The spelling of 20678671 in words is "twenty million, six hundred seventy-eight thousand, six hundred seventy-one".