20400203212004 has 36 divisors (see below), whose sum is σ = 45304347397680. Its totient is φ = 7948131120720.

The previous prime is 20400203211991. The next prime is 20400203212007. The reversal of 20400203212004 is 40021230200402.

It is not an unprimeable number, because it can be changed into a prime (20400203212007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4731028274 + ... + 4731032585.

It is an arithmetic number, because the mean of its divisors is an integer number (1258454094380).

Almost surely, 2^{20400203212004} is an apocalyptic number.

It is an amenable number.

20400203212004 is an abundant number, since it is smaller than the sum of its proper divisors (24904144185676).

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

20400203212004 is a wasteful number, since it uses less digits than its factorization.

20400203212004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9462060888 (or 9462060879 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20400203212004 its reverse (40021230200402), we get a palindrome (60421433412406).

The spelling of 20400203212004 in words is "twenty trillion, four hundred billion, two hundred three million, two hundred twelve thousand, four".