20450 has 12 divisors (see below), whose sum is σ = 38130. Its totient is φ = 8160.

The previous prime is 20443. The next prime is 20477. The reversal of 20450 is 5402.

20450 = 3⁶ + 4⁶ + 5⁶.

It is a Cunningham number, because it is equal to 143²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 18769 + 1681 = 137^2 + 41^2 .

It is an unprimeable number.

20450 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 5 ways as a sum of consecutive naturals, for example, 155 + ... + 254.

2²⁰⁴⁵⁰ is an apocalyptic number.

20450 is a deficient number, since it is larger than the sum of its proper divisors (17680).

20450 is a wasteful number, since it uses less digits than its factorization.

With its successor (20451) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (421).

20450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20450 is about 143.0034964608. The cubic root of 20450 is about 27.3462494314.

Adding to 20450 its reverse (5402), we get a palindrome (25852).

The spelling of 20450 in words is "twenty thousand, four hundred fifty".