20255503 has 4 divisors (see below), whose sum is σ = 20289808. Its totient is φ = 20221200.

The previous prime is 20255447. The next prime is 20255509. The reversal of 20255503 is 30555202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30555202 = 2 ⋅15277601.

It is a cyclic number.

It is not a de Polignac number, because 20255503 - 2⁹ = 20254991 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 (20255509) 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, 16251 + ... + 17452.

It is an arithmetic number, because the mean of its divisors is an integer number (5072452).

Almost surely, 2^20255503 is an apocalyptic number.

20255503 is a deficient number, since it is larger than the sum of its proper divisors (34305).

20255503 is an equidigital number, since it uses as much as digits as its factorization.

20255503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34304.

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

The square root of 20255503 is about 4500.6114029096. The cubic root of 20255503 is about 272.5927770951.

The spelling of 20255503 in words is "twenty million, two hundred fifty-five thousand, five hundred three".