20688490272 has 144 divisors (see below), whose sum is σ = 57991725792. Its totient is φ = 6435655680.

The previous prime is 20688490261. The next prime is 20688490301. The reversal of 20688490272 is 27209488602.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 23 ways as a sum of consecutive naturals, for example, 36231747 + ... + 36232317.

It is an arithmetic number, because the mean of its divisors is an integer number (402720318).

Almost surely, 2^20688490272 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 20688490272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28995862896).

20688490272 is an abundant number, since it is smaller than the sum of its proper divisors (37303235520).

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

20688490272 is a wasteful number, since it uses less digits than its factorization.

20688490272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 20688490272 in words is "twenty billion, six hundred eighty-eight million, four hundred ninety thousand, two hundred seventy-two".