20660253 has 16 divisors (see below), whose sum is σ = 29848896. Its totient is φ = 12660480.

The previous prime is 20660251. The next prime is 20660261. The reversal of 20660253 is 35206602.

It is not a de Polignac number, because 20660253 - 2¹ = 20660251 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660251) 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 15 ways as a sum of consecutive naturals, for example, 2518 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (1865556).

Almost surely, 2^20660253 is an apocalyptic number.

It is an amenable number.

20660253 is a deficient number, since it is larger than the sum of its proper divisors (9188643).

20660253 is a wasteful number, since it uses less digits than its factorization.

20660253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9484.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20660253 is about 4545.3551016395. The cubic root of 20660253 is about 274.3964858651.

Adding to 20660253 its reverse (35206602), we get a palindrome (55866855).

The spelling of 20660253 in words is "twenty million, six hundred sixty thousand, two hundred fifty-three".