20000000000 has 132 divisors (see below), whose sum is σ = 49987791945.
Its totient is φ = 8000000000.
The previous prime is 19999999967. The next prime is 20000000089. The reversal of 20000000000 is 2.
It is a powerful number, because all its prime factors have an exponent greater than 1
and also an Achilles number because it is not a perfect power.
It can be written as a sum of positive squares in 6 ways, for example, as 11512431616 + 8487568384 = 107296^2 + 92128^2
It is a sliding number, since 20000000000 = 10000000000 + 10000000000 and 1/10000000000 + 1/10000000000 = 0.00000000020000000000.
It is an ABA number since it can be written as A⋅BA, here for A=2, B=100000.
It is a Harshad number since it is a multiple of its sum of digits (2).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a Leyland number of the form 1010 + 1010.
It is a nialpdrome in base 10.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 10 ways as a sum of consecutive naturals, for example, 3999999998 + ... + 4000000002.
Almost surely, 220000000000 is an apocalyptic number.
20000000000 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 20000000000
20000000000 is an abundant number, since it is smaller than the sum of its proper divisors (29987791945).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20000000000 is an frugal number, since it uses more digits than its factorization.
20000000000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 72 (or 7 counting only the distinct ones).
The product of its (nonzero) digits is 2, while the sum is 2.
The spelling of 20000000000 in words is "twenty billion", and thus it is an aban number and an uban number.