20654 has 8 divisors (see below), whose sum is σ = 32400. Its totient is φ = 9856.

The previous prime is 20641. The next prime is 20663. The reversal of 20654 is 45602.

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

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 inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20654.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179 + ... + 270.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2²⁰⁶⁵⁴ is an apocalyptic number.

20654 is a deficient number, since it is larger than the sum of its proper divisors (11746).

20654 is a wasteful number, since it uses less digits than its factorization.

20654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20654 is about 143.7149957381. The cubic root of 20654 is about 27.4368800267.

The spelling of 20654 in words is "twenty thousand, six hundred fifty-four".