20053251 has 20 divisors (see below), whose sum is σ = 31720392. Its totient is φ = 12581568.

The previous prime is 20053237. The next prime is 20053259. The reversal of 20053251 is 15235002.

It is a happy number.

It is not a de Polignac number, because 20053251 - 2¹⁷ = 19922179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20053259) 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 19 ways as a sum of consecutive naturals, for example, 5905 + ... + 8658.

Almost surely, 2^20053251 is an apocalyptic number.

20053251 is a deficient number, since it is larger than the sum of its proper divisors (11667141).

20053251 is a wasteful number, since it uses less digits than its factorization.

20053251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14592 (or 14583 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20053251 is about 4478.0856400922. The cubic root of 20053251 is about 271.6824572519.

Adding to 20053251 its reverse (15235002), we get a palindrome (35288253).

The spelling of 20053251 in words is "twenty million, fifty-three thousand, two hundred fifty-one".