20965613 has 4 divisors (see below), whose sum is σ = 20990880. Its totient is φ = 20940348.

The previous prime is 20965603. The next prime is 20965621. The reversal of 20965613 is 31656902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20965613 - 2⁴ = 20965597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20965613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11345 + ... + 13062.

It is an arithmetic number, because the mean of its divisors is an integer number (5247720).

Almost surely, 2^20965613 is an apocalyptic number.

It is an amenable number.

20965613 is a deficient number, since it is larger than the sum of its proper divisors (25267).

20965613 is an equidigital number, since it uses as much as digits as its factorization.

20965613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25266.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20965613 is about 4578.8222284775. The cubic root of 20965613 is about 275.7417462796.

The spelling of 20965613 in words is "twenty million, nine hundred sixty-five thousand, six hundred thirteen".