20995253 has 4 divisors (see below), whose sum is σ = 21187980. Its totient is φ = 20802528.

The previous prime is 20995237. The next prime is 20995267. The reversal of 20995253 is 35259902.

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 14730244 + 6265009 = 3838^2 + 2503^2 .

It is a cyclic number.

It is not a de Polignac number, because 20995253 - 2⁴ = 20995237 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 (20995213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96200 + ... + 96417.

It is an arithmetic number, because the mean of its divisors is an integer number (5296995).

Almost surely, 2^20995253 is an apocalyptic number.

It is an amenable number.

20995253 is a deficient number, since it is larger than the sum of its proper divisors (192727).

20995253 is a wasteful number, since it uses less digits than its factorization.

20995253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192726.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 20995253 is about 4582.0577255203. The cubic root of 20995253 is about 275.8716277968.

The spelling of 20995253 in words is "twenty million, nine hundred ninety-five thousand, two hundred fifty-three".