20001200004 has 18 divisors (see below), whose sum is σ = 50558588990. Its totient is φ = 6667066656.

The previous prime is 20001199973. The next prime is 20001200047. The reversal of 20001200004 is 40000210002.

It can be written as a sum of positive squares in only one way, i.e., 17862322500 + 2138877504 = 133650^2 + 46248^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 277794409 + ... + 277794480.

Almost surely, 2^20001200004 is an apocalyptic number.

It is an amenable number.

20001200004 is an abundant number, since it is smaller than the sum of its proper divisors (30557388986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20001200004 is a wasteful number, since it uses less digits than its factorization.

20001200004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555588899 (or 555588894 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20001200004 its reverse (40000210002), we get a palindrome (60001410006).

The spelling of 20001200004 in words is "twenty billion, one million, two hundred thousand, four".