20634253 has 4 divisors (see below), whose sum is σ = 20916988. Its totient is φ = 20351520.

The previous prime is 20634241. The next prime is 20634259. The reversal of 20634253 is 35243602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11410884 + 9223369 = 3378^2 + 3037^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634253 - 2⁵ = 20634221 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 (20634259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141258 + ... + 141403.

It is an arithmetic number, because the mean of its divisors is an integer number (5229247).

Almost surely, 2^20634253 is an apocalyptic number.

It is an amenable number.

20634253 is a deficient number, since it is larger than the sum of its proper divisors (282735).

20634253 is an equidigital number, since it uses as much as digits as its factorization.

20634253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282734.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20634253 is about 4542.4941386864. The cubic root of 20634253 is about 274.2813323307.

Adding to 20634253 its reverse (35243602), we get a palindrome (55877855).

The spelling of 20634253 in words is "twenty million, six hundred thirty-four thousand, two hundred fifty-three".