20648405800 has 144 divisors (see below), whose sum is σ = 55275480000. Its totient is φ = 7113052800.

The previous prime is 20648405783. The next prime is 20648405803. The reversal of 20648405800 is 850484602.

It is a self number, because there is not a number n which added to its sum of digits gives 20648405800.

It is not an unprimeable number, because it can be changed into a prime (20648405803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 781201 + ... + 807199.

It is an arithmetic number, because the mean of its divisors is an integer number (383857500).

Almost surely, 2^20648405800 is an apocalyptic number.

20648405800 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 20648405800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27637740000).

20648405800 is an abundant number, since it is smaller than the sum of its proper divisors (34627074200).

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

20648405800 is a wasteful number, since it uses less digits than its factorization.

20648405800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26064 (or 26036 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The spelling of 20648405800 in words is "twenty billion, six hundred forty-eight million, four hundred five thousand, eight hundred".