20011000000 has 98 divisors (see below), whose sum is σ = 49638505244. Its totient is φ = 8004000000.

The previous prime is 20010999997. The next prime is 20011000001. The reversal of 20011000000 is 11002.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is not an unprimeable number, because it can be changed into a prime (20011000001) 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, 989995 + ... + 1010005.

Almost surely, 2^20011000000 is an apocalyptic number.

20011000000 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 20011000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24819252622).

20011000000 is an abundant number, since it is smaller than the sum of its proper divisors (29627505244).

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

20011000000 is an frugal number, since it uses more digits than its factorization.

20011000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20053 (or 20018 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

Adding to 20011000000 its reverse (11002), we get a palindrome (20011011002).

It can be divided in two parts, 2001 and 1000000, that added together give a palindrome (1002001).

The spelling of 20011000000 in words is "twenty billion, eleven million", and thus it is an aban number and an uban number.