20008649189 has 4 divisors (see below), whose sum is σ = 20473966656. Its totient is φ = 19543331724.

The previous prime is 20008649161. The next prime is 20008649197. The reversal of 20008649189 is 98194680002.

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-20008649189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008649119) 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, 232658669 + ... + 232658754.

It is an arithmetic number, because the mean of its divisors is an integer number (5118491664).

Almost surely, 2^20008649189 is an apocalyptic number.

It is an amenable number.

20008649189 is a deficient number, since it is larger than the sum of its proper divisors (465317467).

20008649189 is an equidigital number, since it uses as much as digits as its factorization.

20008649189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465317466.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 20008649189 in words is "twenty billion, eight million, six hundred forty-nine thousand, one hundred eighty-nine".