20569613 has 8 divisors (see below), whose sum is σ = 22204800. Its totient is φ = 18996208.

The previous prime is 20569589. The next prime is 20569621. The reversal of 20569613 is 31696502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20569613 - 2²² = 16375309 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 20569613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20569513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14753 + ... + 16086.

It is an arithmetic number, because the mean of its divisors is an integer number (2775600).

Almost surely, 2^20569613 is an apocalyptic number.

20569613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20569613 is a deficient number, since it is larger than the sum of its proper divisors (1635187).

20569613 is a wasteful number, since it uses less digits than its factorization.

20569613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30891.

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

The square root of 20569613 is about 4535.3735237574. The cubic root of 20569613 is about 273.9946231207.

The spelling of 20569613 in words is "twenty million, five hundred sixty-nine thousand, six hundred thirteen".