20245205 has 16 divisors (see below), whose sum is σ = 24933744. Its totient is φ = 15774720.

The previous prime is 20245187. The next prime is 20245213. The reversal of 20245205 is 50254202.

It can be written as a sum of positive squares in 8 ways, for example, as 192721 + 20052484 = 439^2 + 4478^2 .

It is not a de Polignac number, because 20245205 - 2⁸ = 20244949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63707 + ... + 64023.

It is an arithmetic number, because the mean of its divisors is an integer number (1558359).

Almost surely, 2^20245205 is an apocalyptic number.

It is an amenable number.

20245205 is a deficient number, since it is larger than the sum of its proper divisors (4688539).

20245205 is a wasteful number, since it uses less digits than its factorization.

20245205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20245205 is about 4499.4671906794. The cubic root of 20245205 is about 272.5465734160.

Adding to 20245205 its reverse (50254202), we get a palindrome (70499407).

The spelling of 20245205 in words is "twenty million, two hundred forty-five thousand, two hundred five".