23420 has 12 divisors (see below), whose sum is σ = 49224. Its totient is φ = 9360.

The previous prime is 23417. The next prime is 23431. The reversal of 23420 is 2432.

23420 is nontrivially palindromic in base 11.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566 + ... + 605.

It is an arithmetic number, because the mean of its divisors is an integer number (4102).

2²³⁴²⁰ is an apocalyptic number.

23420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23420 is an abundant number, since it is smaller than the sum of its proper divisors (25804).

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 (24612).

23420 is a wasteful number, since it uses less digits than its factorization.

23420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 23420 is about 153.0359434904. The cubic root of 23420 is about 28.6107316239.

Subtracting from 23420 its sum of digits (11), we obtain a square (23409 = 153²).

Adding to 23420 its reverse (2432), we get a palindrome (25852).

The spelling of 23420 in words is "twenty-three thousand, four hundred twenty", and thus it is an iban number.