20863253 has 4 divisors (see below), whose sum is σ = 21307200. Its totient is φ = 20419308.

The previous prime is 20863247. The next prime is 20863289. The reversal of 20863253 is 35236802.

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 20863253 - 2⁸ = 20862997 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 (20863753) 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, 221903 + ... + 221996.

It is an arithmetic number, because the mean of its divisors is an integer number (5326800).

Almost surely, 2^20863253 is an apocalyptic number.

It is an amenable number.

20863253 is a deficient number, since it is larger than the sum of its proper divisors (443947).

20863253 is an equidigital number, since it uses as much as digits as its factorization.

20863253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443946.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 20863253 is about 4567.6310052367. The cubic root of 20863253 is about 275.2922644837.

The spelling of 20863253 in words is "twenty million, eight hundred sixty-three thousand, two hundred fifty-three".