12800000020 has 48 divisors (see below), whose sum is σ = 28205573760. Its totient is φ = 4870000256.

The previous prime is 12799999981. The next prime is 12800000021. The reversal of 12800000020 is 2000000821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12800000021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4614 + ... + 160066.

It is an arithmetic number, because the mean of its divisors is an integer number (587616120).

Almost surely, 2^12800000020 is an apocalyptic number.

12800000020 is a gapful number since it is divisible by the number (10) 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 12800000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14102786880).

12800000020 is an abundant number, since it is smaller than the sum of its proper divisors (15405573740).

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

12800000020 is a wasteful number, since it uses less digits than its factorization.

12800000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155664 (or 155662 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12800000020 its reverse (2000000821), we get a palindrome (14800000841).

The spelling of 12800000020 in words is "twelve billion, eight hundred million, twenty", and thus it is an aban number.