20940644088 has 192 divisors, whose sum is σ = 72054528000. Its totient is φ = 5344600320.

The previous prime is 20940644071. The next prime is 20940644159. The reversal of 20940644088 is 88044604902.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 151563 + ... + 254661.

It is an arithmetic number, because the mean of its divisors is an integer number (375284000).

Almost surely, 2^20940644088 is an apocalyptic number.

20940644088 is a gapful number since it is divisible by the number (28) 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 20940644088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36027264000).

20940644088 is an abundant number, since it is smaller than the sum of its proper divisors (51113883912).

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

20940644088 is a wasteful number, since it uses less digits than its factorization.

20940644088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103162 (or 103155 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 20940644088 in words is "twenty billion, nine hundred forty million, six hundred forty-four thousand, eighty-eight".