20255863 has 4 divisors (see below), whose sum is σ = 20265040. Its totient is φ = 20246688.

The previous prime is 20255839. The next prime is 20255897. The reversal of 20255863 is 36855202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36855202 = 2 ⋅18427601.

It is a cyclic number.

It is not a de Polignac number, because 20255863 - 2¹³ = 20247671 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 (20255813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (5066260).

Almost surely, 2^20255863 is an apocalyptic number.

20255863 is a deficient number, since it is larger than the sum of its proper divisors (9177).

20255863 is an equidigital number, since it uses as much as digits as its factorization.

20255863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9176.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20255863 is about 4500.6513972980. The cubic root of 20255863 is about 272.5943920112.

It can be divided in two parts, 202 and 55863, that added together give a palindrome (56065).

The spelling of 20255863 in words is "twenty million, two hundred fifty-five thousand, eight hundred sixty-three".