20005255 has 16 divisors (see below), whose sum is σ = 24668064. Its totient is φ = 15569280.

The previous prime is 20005231. The next prime is 20005259. The reversal of 20005255 is 55250002.

It is a de Polignac number, because none of the positive numbers 2^k-20005255 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 (20005259) 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, 32329 + ... + 32941.

It is an arithmetic number, because the mean of its divisors is an integer number (1541754).

Almost surely, 2^20005255 is an apocalyptic number.

20005255 is a deficient number, since it is larger than the sum of its proper divisors (4662809).

20005255 is a wasteful number, since it uses less digits than its factorization.

20005255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20005255 is about 4472.7234432726. The cubic root of 20005255 is about 271.4655333519.

Adding to 20005255 its reverse (55250002), we get a palindrome (75255257).

The spelling of 20005255 in words is "twenty million, five thousand, two hundred fifty-five".