20450245 has 4 divisors (see below), whose sum is σ = 24540300. Its totient is φ = 16360192.

The previous prime is 20450239. The next prime is 20450263. The reversal of 20450245 is 54205402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54205402 = 2 ⋅27102701.

It can be written as a sum of positive squares in 2 ways, for example, as 8767521 + 11682724 = 2961^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 20450245 - 2⁷ = 20450117 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 2045020 + ... + 2045029.

It is an arithmetic number, because the mean of its divisors is an integer number (6135075).

Almost surely, 2^20450245 is an apocalyptic number.

It is an amenable number.

20450245 is a deficient number, since it is larger than the sum of its proper divisors (4090055).

20450245 is an equidigital number, since it uses as much as digits as its factorization.

20450245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090054.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20450245 is about 4522.1947105360. The cubic root of 20450245 is about 273.4635863765.

Adding to 20450245 its reverse (54205402), we get a palindrome (74655647).

The spelling of 20450245 in words is "twenty million, four hundred fifty thousand, two hundred forty-five".