20678 has 12 divisors (see below), whose sum is σ = 36252. Its totient is φ = 8820.

The previous prime is 20663. The next prime is 20681. The reversal of 20678 is 87602.

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 12 and base 14.

It is a congruent number.

It is an unprimeable number.

20678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8 + ... + 203.

It is an arithmetic number, because the mean of its divisors is an integer number (3021).

2²⁰⁶⁷⁸ is an apocalyptic number.

20678 is a deficient number, since it is larger than the sum of its proper divisors (15574).

20678 is a wasteful number, since it uses less digits than its factorization.

20678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 220 counting only the distinct ones).

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

The square root of 20678 is about 143.7984700892. The cubic root of 20678 is about 27.4475031543.

The spelling of 20678 in words is "twenty thousand, six hundred seventy-eight".