20474 has 8 divisors (see below), whose sum is σ = 31860. Its totient is φ = 9856.

The previous prime is 20443. The next prime is 20477. The reversal of 20474 is 47402.

It can be written as a sum of positive squares in 2 ways, for example, as 20449 + 25 = 143^2 + 5^2 .

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

It is a Curzon number.

It is a plaindrome in base 5 and base 7.

It is a nialpdrome in base 12 and base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20474.

It is not an unprimeable number, because it can be changed into a prime (20477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119 + ... + 234.

2²⁰⁴⁷⁴ is an apocalyptic number.

20474 is a deficient number, since it is larger than the sum of its proper divisors (11386).

20474 is a wasteful number, since it uses less digits than its factorization.

20474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20474 is about 143.0873858871. The cubic root of 20474 is about 27.3569430484.

Adding to 20474 its reverse (47402), we get a palindrome (67876).

It can be divided in two parts, 20 and 474, that added together give a palindrome (494).

The spelling of 20474 in words is "twenty thousand, four hundred seventy-four", and thus it is an iban number.