20454 has 16 divisors (see below), whose sum is σ = 46848. Its totient is φ = 5832.

The previous prime is 20443. The next prime is 20477. The reversal of 20454 is 45402.

20454 = 70² + 71² + ... + 73².

It is a super-2 number, since 2×20454² = 836732232, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202 + ... + 285.

It is an arithmetic number, because the mean of its divisors is an integer number (2928).

2²⁰⁴⁵⁴ is an apocalyptic number.

20454 is an abundant number, since it is smaller than the sum of its proper divisors (26394).

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 (23424).

20454 is a wasteful number, since it uses less digits than its factorization.

20454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20454 is about 143.0174814489. The cubic root of 20454 is about 27.3480322817.

Adding to 20454 its reverse (45402), we get a palindrome (65856).

It can be divided in two parts, 20 and 454, that added together give a palindrome (474).

The spelling of 20454 in words is "twenty thousand, four hundred fifty-four".