20389253 has 4 divisors (see below), whose sum is σ = 20398368. Its totient is φ = 20380140.

The previous prime is 20389249. The next prime is 20389297. The reversal of 20389253 is 35298302.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20389253 - 2² = 20389249 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 (20380253) 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, 1358 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (5099592).

Almost surely, 2^20389253 is an apocalyptic number.

It is an amenable number.

20389253 is a deficient number, since it is larger than the sum of its proper divisors (9115).

20389253 is an equidigital number, since it uses as much as digits as its factorization.

20389253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20389253 is about 4515.4460466271. The cubic root of 20389253 is about 273.1914510850.

The spelling of 20389253 in words is "twenty million, three hundred eighty-nine thousand, two hundred fifty-three".