20545253 has 4 divisors (see below), whose sum is σ = 21253740. Its totient is φ = 19836768.

The previous prime is 20545247. The next prime is 20545267. The reversal of 20545253 is 35254502.

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 8862529 + 11682724 = 2977^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545253 - 2⁴ = 20545237 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 (20545243) 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, 354200 + ... + 354257.

It is an arithmetic number, because the mean of its divisors is an integer number (5313435).

Almost surely, 2^20545253 is an apocalyptic number.

It is an amenable number.

20545253 is a deficient number, since it is larger than the sum of its proper divisors (708487).

20545253 is an equidigital number, since it uses as much as digits as its factorization.

20545253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708486.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 20545253 is about 4532.6871720868. The cubic root of 20545253 is about 273.8864190827.

Adding to 20545253 its reverse (35254502), we get a palindrome (55799755).

The spelling of 20545253 in words is "twenty million, five hundred forty-five thousand, two hundred fifty-three".