20425253 has 4 divisors (see below), whose sum is σ = 20477100. Its totient is φ = 20373408.

The previous prime is 20425243. The next prime is 20425271. The reversal of 20425253 is 35252402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35252402 = 2 ⋅17626201.

It can be written as a sum of positive squares in 2 ways, for example, as 9972964 + 10452289 = 3158^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425253 - 2⁶ = 20425189 is a prime.

It is a super-2 number, since 2×20425253² = 834381920228018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425243) 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, 25328 + ... + 26121.

It is an arithmetic number, because the mean of its divisors is an integer number (5119275).

Almost surely, 2^20425253 is an apocalyptic number.

It is an amenable number.

20425253 is a deficient number, since it is larger than the sum of its proper divisors (51847).

20425253 is an equidigital number, since it uses as much as digits as its factorization.

20425253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51846.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20425253 is about 4519.4306057290. The cubic root of 20425253 is about 273.3521421058.

Adding to 20425253 its reverse (35252402), we get a palindrome (55677655).

The spelling of 20425253 in words is "twenty million, four hundred twenty-five thousand, two hundred fifty-three".