20005450 has 12 divisors (see below), whose sum is σ = 37210230. Its totient is φ = 8002160.

The previous prime is 20005441. The next prime is 20005451. The reversal of 20005450 is 5450002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17969121 + 2036329 = 4239^2 + 1427^2 .

It is not an unprimeable number, because it can be changed into a prime (20005451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200005 + ... + 200104.

Almost surely, 2^20005450 is an apocalyptic number.

20005450 is a deficient number, since it is larger than the sum of its proper divisors (17204780).

20005450 is a wasteful number, since it uses less digits than its factorization.

20005450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400121 (or 400116 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20005450 is about 4472.7452420186. The cubic root of 20005450 is about 271.4664153803.

Adding to 20005450 its reverse (5450002), we get a palindrome (25455452).

The spelling of 20005450 in words is "twenty million, five thousand, four hundred fifty".