20006569 has 16 divisors (see below), whose sum is σ = 23405760. Its totient is φ = 16898560.

The previous prime is 20006561. The next prime is 20006579. The reversal of 20006569 is 96560002.

It is a cyclic number.

It is not a de Polignac number, because 20006569 - 2³ = 20006561 is a prime.

It is a super-2 number, since 2×20006569² = 800525606303522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20006561) 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, 14877 + ... + 16165.

It is an arithmetic number, because the mean of its divisors is an integer number (1462860).

Almost surely, 2^20006569 is an apocalyptic number.

It is an amenable number.

20006569 is a deficient number, since it is larger than the sum of its proper divisors (3399191).

20006569 is a wasteful number, since it uses less digits than its factorization.

20006569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20006569 is about 4472.8703312303. The cubic root of 20006569 is about 271.4714767553.

The spelling of 20006569 in words is "twenty million, six thousand, five hundred sixty-nine".