20003531009 has 16 divisors (see below), whose sum is σ = 24954677376. Its totient is φ = 15577660800.

The previous prime is 20003531003. The next prime is 20003531011. The reversal of 20003531009 is 90013530002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20003531009 - 2⁸ = 20003530753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003531003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49199 + ... + 205979.

It is an arithmetic number, because the mean of its divisors is an integer number (1559667336).

Almost surely, 2^20003531009 is an apocalyptic number.

It is an amenable number.

20003531009 is a deficient number, since it is larger than the sum of its proper divisors (4951146367).

20003531009 is a wasteful number, since it uses less digits than its factorization.

20003531009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158456.

The product of its (nonzero) digits is 810, while the sum is 23.

The spelling of 20003531009 in words is "twenty billion, three million, five hundred thirty-one thousand, nine".