20000020000 has 120 divisors (see below), whose sum is σ = 49695226812. Its totient is φ = 7920000000.

The previous prime is 20000019973. The next prime is 20000020009. The reversal of 20000020000 is 2000002.

It can be written as a sum of positive squares in 10 ways, for example, as 1760977296 + 18239042704 = 41964^2 + 135052^2 .

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (20000020009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2015050 + ... + 2024950.

Almost surely, 2^20000020000 is an apocalyptic number.

20000020000 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 20000020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24847613406).

20000020000 is an abundant number, since it is smaller than the sum of its proper divisors (29695206812).

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

20000020000 is an equidigital number, since it uses as much as digits as its factorization.

20000020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10032 (or 10009 counting only the distinct ones).

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

Adding to 20000020000 its reverse (2000002), we get a palindrome (20002020002).

20000020000 divided by its reverse (2000002) gives a 4-th power (10000 = 10⁴).

The spelling of 20000020000 in words is "twenty billion, twenty thousand".