20660353 has 16 divisors (see below), whose sum is σ = 25661440. Its totient is φ = 16232400.

The previous prime is 20660347. The next prime is 20660377. The reversal of 20660353 is 35306602.

It is a cyclic number.

It is not a de Polignac number, because 20660353 - 2¹⁷ = 20529281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20660303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1618 + ... + 6628.

It is an arithmetic number, because the mean of its divisors is an integer number (1603840).

Almost surely, 2^20660353 is an apocalyptic number.

It is an amenable number.

20660353 is a deficient number, since it is larger than the sum of its proper divisors (5001087).

20660353 is a wasteful number, since it uses less digits than its factorization.

20660353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 20660353 is about 4545.3661018668. The cubic root of 20660353 is about 274.3969285767.

Adding to 20660353 its reverse (35306602), we get a palindrome (55966955).

The spelling of 20660353 in words is "twenty million, six hundred sixty thousand, three hundred fifty-three".