20488289640 has 384 divisors, whose sum is σ = 77737968000. Its totient is φ = 4281403392.

The previous prime is 20488289597. The next prime is 20488289711. The reversal of 20488289640 is 4698288402.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8330731 + ... + 8333189.

It is an arithmetic number, because the mean of its divisors is an integer number (202442625).

Almost surely, 2^20488289640 is an apocalyptic number.

20488289640 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 20488289640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38868984000).

20488289640 is an abundant number, since it is smaller than the sum of its proper divisors (57249678360).

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

20488289640 is a wasteful number, since it uses less digits than its factorization.

20488289640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609 (or 2598 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 20488289640 in words is "twenty billion, four hundred eighty-eight million, two hundred eighty-nine thousand, six hundred forty".