20563253 has 4 divisors (see below), whose sum is σ = 20582688. Its totient is φ = 20543820.

The previous prime is 20563237. The next prime is 20563259. The reversal of 20563253 is 35236502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20563253 - 2⁴ = 20563237 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 (20563259) 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, 8033 + ... + 10278.

It is an arithmetic number, because the mean of its divisors is an integer number (5145672).

Almost surely, 2^20563253 is an apocalyptic number.

It is an amenable number.

20563253 is a deficient number, since it is larger than the sum of its proper divisors (19435).

20563253 is a wasteful number, since it uses less digits than its factorization.

20563253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19434.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 20563253 is about 4534.6723145118. The cubic root of 20563253 is about 273.9663810494.

Adding to 20563253 its reverse (35236502), we get a palindrome (55799755).

The spelling of 20563253 in words is "twenty million, five hundred sixty-three thousand, two hundred fifty-three".