20008609 has 8 divisors (see below), whose sum is σ = 21869568. Its totient is φ = 18223680.

The previous prime is 20008607. The next prime is 20008621. The reversal of 20008609 is 90680002.

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 20008609 - 2¹ = 20008607 is a prime.

It is a super-2 number, since 2×20008609² = 800688868229762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20008603) 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 7 ways as a sum of consecutive naturals, for example, 18457 + ... + 19510.

It is an arithmetic number, because the mean of its divisors is an integer number (2733696).

Almost surely, 2^20008609 is an apocalyptic number.

It is an amenable number.

20008609 is a deficient number, since it is larger than the sum of its proper divisors (1860959).

20008609 is a wasteful number, since it uses less digits than its factorization.

20008609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38015.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20008609 is about 4473.0983669041. The cubic root of 20008609 is about 271.4807034413.

It can be divided in two parts, 2000 and 8609, that added together give a square (10609 = 103²).

The spelling of 20008609 in words is "twenty million, eight thousand, six hundred nine".