20004228609 has 4 divisors (see below), whose sum is σ = 26672304816. Its totient is φ = 13336152404.

The previous prime is 20004228581. The next prime is 20004228611. The reversal of 20004228609 is 90682240002.

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 a de Polignac number, because none of the positive numbers 2^k-20004228609 is a prime.

It is a super-2 number, since 2×20004228609² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004228609.

It is not an unprimeable number, because it can be changed into a prime (20004228619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3334038099 + ... + 3334038104.

It is an arithmetic number, because the mean of its divisors is an integer number (6668076204).

Almost surely, 2^20004228609 is an apocalyptic number.

It is an amenable number.

20004228609 is a deficient number, since it is larger than the sum of its proper divisors (6668076207).

20004228609 is an equidigital number, since it uses as much as digits as its factorization.

20004228609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668076206.

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 20004228609 in words is "twenty billion, four million, two hundred twenty-eight thousand, six hundred nine".