20554 has 8 divisors (see below), whose sum is σ = 31680.
Its totient is φ = 9996.
The previous prime is 20551. The next prime is 20563. The reversal of 20554 is 45502.
It is a happy number.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not an unprimeable number, because it can be changed into a prime (20551) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34 + ... + 205.
It is an arithmetic number, because the mean of its divisors is an integer number (3960).
220554 is an apocalyptic number.
20554 is a deficient number, since it is larger than the sum of its proper divisors (11126).
20554 is a wasteful number, since it uses less digits than its factorization.
20554 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 284.
The product of its (nonzero) digits is 200, while the sum is 16.
The square root of 20554 is about 143.3666627916.
The cubic root of 20554 is about 27.3925281987.
The spelling of 20554 in words is "twenty thousand, five hundred fifty-four".