20304255 has 32 divisors (see below), whose sum is σ = 34467840. Its totient is φ = 10177920.

The previous prime is 20304253. The next prime is 20304259. The reversal of 20304255 is 55240302.

It is not a de Polignac number, because 20304255 - 2¹ = 20304253 is a prime.

It is a super-2 number, since 2×20304255² = 824525542210050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54249 + ... + 54621.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120).

Almost surely, 2^20304255 is an apocalyptic number.

20304255 is a deficient number, since it is larger than the sum of its proper divisors (14163585).

20304255 is a wasteful number, since it uses less digits than its factorization.

20304255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20304255 is about 4506.0243008666. The cubic root of 20304255 is about 272.8112987053.

Adding to 20304255 its reverse (55240302), we get a palindrome (75544557).

The spelling of 20304255 in words is "twenty million, three hundred four thousand, two hundred fifty-five".