20688299226 has 192 divisors, whose sum is σ = 57260286720. Its totient is φ = 5255331840.

The previous prime is 20688299197. The next prime is 20688299227. The reversal of 20688299226 is 62299288602.

It is not an unprimeable number, because it can be changed into a prime (20688299227) by changing a digit.

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, 23482306 + ... + 23483186.

It is an arithmetic number, because the mean of its divisors is an integer number (298230660).

Almost surely, 2^20688299226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20688299226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28630143360).

20688299226 is an abundant number, since it is smaller than the sum of its proper divisors (36571987494).

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

20688299226 is a wasteful number, since it uses less digits than its factorization.

20688299226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 20688299226 in words is "twenty billion, six hundred eighty-eight million, two hundred ninety-nine thousand, two hundred twenty-six".