20001200009 has 32 divisors (see below), whose sum is σ = 24757125120. Its totient is φ = 15767186688.

The previous prime is 20001199973. The next prime is 20001200047. The reversal of 20001200009 is 90000210002.

It is a cyclic number.

It is not a de Polignac number, because 20001200009 - 2¹⁶ = 20001134473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001199966 and 20001200002.

It is not an unprimeable number, because it can be changed into a prime (20001200099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4063652 + ... + 4068570.

It is an arithmetic number, because the mean of its divisors is an integer number (773660160).

Almost surely, 2^20001200009 is an apocalyptic number.

It is an amenable number.

20001200009 is a deficient number, since it is larger than the sum of its proper divisors (4755925111).

20001200009 is a wasteful number, since it uses less digits than its factorization.

20001200009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5717.

The product of its (nonzero) digits is 36, while the sum is 14.

The spelling of 20001200009 in words is "twenty billion, one million, two hundred thousand, nine".