20204291 has 4 divisors (see below), whose sum is σ = 20258832. Its totient is φ = 20149752.

The previous prime is 20204273. The next prime is 20204293. The reversal of 20204291 is 19240202.

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

It is a cyclic number.

It is not a de Polignac number, because 20204291 - 2¹⁴ = 20187907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20204293) 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, 26711 + ... + 27456.

It is an arithmetic number, because the mean of its divisors is an integer number (5064708).

Almost surely, 2^20204291 is an apocalyptic number.

20204291 is a deficient number, since it is larger than the sum of its proper divisors (54541).

20204291 is an equidigital number, since it uses as much as digits as its factorization.

20204291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54540.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20204291 is about 4494.9183529848. The cubic root of 20204291 is about 272.3628510531.

Adding to 20204291 its reverse (19240202), we get a palindrome (39444493).

The spelling of 20204291 in words is "twenty million, two hundred four thousand, two hundred ninety-one".