20451130688 has 56 divisors (see below), whose sum is σ = 41258947200. Its totient is φ = 10056204288.

The previous prime is 20451130673. The next prime is 20451130709. The reversal of 20451130688 is 88603115402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291523 + ... + 1307261.

Almost surely, 2^20451130688 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 20451130688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20629473600).

20451130688 is an abundant number, since it is smaller than the sum of its proper divisors (20807816512).

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

20451130688 is a wasteful number, since it uses less digits than its factorization.

20451130688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16087 (or 16077 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 20451130688 in words is "twenty billion, four hundred fifty-one million, one hundred thirty thousand, six hundred eighty-eight".