20204249 has 4 divisors (see below), whose sum is σ = 21758436. Its totient is φ = 18650064.

The previous prime is 20204243. The next prime is 20204269. The reversal of 20204249 is 94240202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1194649 + 19009600 = 1093^2 + 4360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20204249 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 777074 + ... + 777099.

It is an arithmetic number, because the mean of its divisors is an integer number (5439609).

Almost surely, 2^20204249 is an apocalyptic number.

It is an amenable number.

20204249 is a deficient number, since it is larger than the sum of its proper divisors (1554187).

20204249 is a wasteful number, since it uses less digits than its factorization.

20204249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554186.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20204249 is about 4494.9136810399. The cubic root of 20204249 is about 272.3626623268.

The spelling of 20204249 in words is "twenty million, two hundred four thousand, two hundred forty-nine".