20012000000 has 126 divisors (see below), whose sum is σ = 49941626364. Its totient is φ = 8003200000.

The previous prime is 20011999993. The next prime is 20012000003. The reversal of 20012000000 is 21002.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (20012000003) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3997499 + ... + 4002501.

It is an arithmetic number, because the mean of its divisors is an integer number (396362114).

Almost surely, 2^20012000000 is an apocalyptic number.

20012000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20012000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24970813182).

20012000000 is an abundant number, since it is smaller than the sum of its proper divisors (29929626364).

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

20012000000 is an frugal number, since it uses more digits than its factorization.

20012000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049 (or 5010 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

Adding to 20012000000 its reverse (21002), we get a palindrome (20012021002).

The spelling of 20012000000 in words is "twenty billion, twelve million", and thus it is an aban number and an uban number.