20154 has 8 divisors (see below), whose sum is σ = 40320. Its totient is φ = 6716.

The previous prime is 20149. The next prime is 20161. The reversal of 20154 is 45102.

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

20154 is an admirable number.

It is an unprimeable number.

20154 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 3 ways as a sum of consecutive naturals, for example, 1674 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (5040).

2²⁰¹⁵⁴ is an apocalyptic number.

20154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20160).

20154 is a wasteful number, since it uses less digits than its factorization.

20154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20154 is about 141.9647843657. The cubic root of 20154 is about 27.2136681594.

Adding to 20154 its reverse (45102), we get a palindrome (65256).

The spelling of 20154 in words is "twenty thousand, one hundred fifty-four".