20204245 has 16 divisors (see below), whose sum is σ = 25800768. Its totient is φ = 15136000.

The previous prime is 20204243. The next prime is 20204269. The reversal of 20204245 is 54240202.

It is not a de Polignac number, because 20204245 - 2¹ = 20204243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20862 + ... + 21808.

It is an arithmetic number, because the mean of its divisors is an integer number (1612548).

Almost surely, 2^20204245 is an apocalyptic number.

It is an amenable number.

20204245 is a deficient number, since it is larger than the sum of its proper divisors (5596523).

20204245 is a wasteful number, since it uses less digits than its factorization.

20204245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20204245 is about 4494.9132360925. The cubic root of 20204245 is about 272.3626443528.

Adding to 20204245 its reverse (54240202), we get a palindrome (74444447).

It can be divided in two parts, 20204 and 245, that added together give a square (20449 = 143²).

The spelling of 20204245 in words is "twenty million, two hundred four thousand, two hundred forty-five".