20663313 has 16 divisors (see below), whose sum is σ = 31824576. Its totient is φ = 11786240.

The previous prime is 20663309. The next prime is 20663327. The reversal of 20663313 is 31336602.

It is a cyclic number.

It is not a de Polignac number, because 20663313 - 2² = 20663309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20663333) 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, 17856 + ... + 18977.

It is an arithmetic number, because the mean of its divisors is an integer number (1989036).

Almost surely, 2^20663313 is an apocalyptic number.

It is an amenable number.

20663313 is a deficient number, since it is larger than the sum of its proper divisors (11161263).

20663313 is a wasteful number, since it uses less digits than its factorization.

20663313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36864.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 20663313 is about 4545.6916965408. The cubic root of 20663313 is about 274.4100321948.

Adding to 20663313 its reverse (31336602), we get a palindrome (51999915).

Subtracting 20663313 from its reverse (31336602), we obtain a square (10673289 = 3267²).

The spelling of 20663313 in words is "twenty million, six hundred sixty-three thousand, three hundred thirteen".