20012002000 has 40 divisors (see below), whose sum is σ = 48389025672. Its totient is φ = 8004800000.

The previous prime is 20012001991. The next prime is 20012002001. The reversal of 20012002000 is 20021002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 399680064 + 19612321936 = 19992^2 + 140044^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012002001) 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 7 ways as a sum of consecutive naturals, for example, 5001001 + ... + 5005000.

Almost surely, 2^20012002000 is an apocalyptic number.

20012002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012002000 is an abundant number, since it is smaller than the sum of its proper divisors (28377023672).

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

20012002000 is a wasteful number, since it uses less digits than its factorization.

20012002000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006024 (or 10006008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 20012002000 its reverse (20021002), we get a palindrome (20032023002).

The spelling of 20012002000 in words is "twenty billion, twelve million, two thousand".