20611328800 has 36 divisors (see below), whose sum is σ = 50317408386. Its totient is φ = 8244531200.

The previous prime is 20611328797. The next prime is 20611328807. The reversal of 20611328800 is 882311602.

It can be written as a sum of positive squares in 3 ways, for example, as 18429691536 + 2181637264 = 135756^2 + 46708^2 .

It is not an unprimeable number, because it can be changed into a prime (20611328807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12881281 + ... + 12882880.

Almost surely, 2^20611328800 is an apocalyptic number.

20611328800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20611328800 is an abundant number, since it is smaller than the sum of its proper divisors (29706079586).

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

20611328800 is a wasteful number, since it uses less digits than its factorization.

20611328800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25764181 (or 25764168 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 20611328800 in words is "twenty billion, six hundred eleven million, three hundred twenty-eight thousand, eight hundred".