20988400896 has 108 divisors (see below), whose sum is σ = 60850278580. Its totient is φ = 6957342720.

The previous prime is 20988400891. The next prime is 20988400907. The reversal of 20988400896 is 69800488902.

It can be written as a sum of positive squares in 2 ways, for example, as 183223296 + 20805177600 = 13536^2 + 144240^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988400891) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 391860 + ... + 442188.

Almost surely, 2^20988400896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20988400896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30425139290).

20988400896 is an abundant number, since it is smaller than the sum of its proper divisors (39861877684).

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

20988400896 is a wasteful number, since it uses less digits than its factorization.

20988400896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50532 (or 50515 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 20988400896 in words is "twenty billion, nine hundred eighty-eight million, four hundred thousand, eight hundred ninety-six".