20475089688 has 128 divisors (see below), whose sum is σ = 52722072000. Its totient is φ = 6624184320.

The previous prime is 20475089581. The next prime is 20475089699. The reversal of 20475089688 is 88698057402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52634998 + ... + 52635386.

Almost surely, 2^20475089688 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 20475089688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26361036000).

20475089688 is an abundant number, since it is smaller than the sum of its proper divisors (32246982312).

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

20475089688 is a wasteful number, since it uses less digits than its factorization.

20475089688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 20475089688 in words is "twenty billion, four hundred seventy-five million, eighty-nine thousand, six hundred eighty-eight".