20427 has 8 divisors (see below), whose sum is σ = 29760. Its totient is φ = 12360.

The previous prime is 20411. The next prime is 20431. The reversal of 20427 is 72402.

20427 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 20427 - 2⁴ = 20411 is a prime.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (20407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277 + ... + 342.

It is an arithmetic number, because the mean of its divisors is an integer number (3720).

2²⁰⁴²⁷ is an apocalyptic number.

20427 is a deficient number, since it is larger than the sum of its proper divisors (9333).

20427 is a wasteful number, since it uses less digits than its factorization.

20427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 20427 is about 142.9230562226. The cubic root of 20427 is about 27.3359935279.

Adding to 20427 its reverse (72402), we get a palindrome (92829).

It can be divided in two parts, 204 and 27, that added together give a triangular number (231 = T₂₁).

The spelling of 20427 in words is "twenty thousand, four hundred twenty-seven", and thus it is an iban number.