20503255 has 4 divisors (see below), whose sum is σ = 24603912. Its totient is φ = 16402600.

The previous prime is 20503253. The next prime is 20503271. The reversal of 20503255 is 55230502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55230502 = 2 ⋅27615251.

It is not a de Polignac number, because 20503255 - 2¹ = 20503253 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503253) 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, 2050321 + ... + 2050330.

It is an arithmetic number, because the mean of its divisors is an integer number (6150978).

Almost surely, 2^20503255 is an apocalyptic number.

20503255 is a deficient number, since it is larger than the sum of its proper divisors (4100657).

20503255 is an equidigital number, since it uses as much as digits as its factorization.

20503255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100656.

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 20503255 is about 4528.0520094186. The cubic root of 20503255 is about 273.6996682623.

Adding to 20503255 its reverse (55230502), we get a palindrome (75733757).

The spelling of 20503255 in words is "twenty million, five hundred three thousand, two hundred fifty-five".