20289022008 has 128 divisors (see below), whose sum is σ = 52686443520. Its totient is φ = 6507072000.

The previous prime is 20289022001. The next prime is 20289022031. The reversal of 20289022008 is 80022098202.

It is a super-4 number, since 4×20289022008⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20289022008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289022001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27015633 + ... + 27016383.

It is an arithmetic number, because the mean of its divisors is an integer number (411612840).

Almost surely, 2^20289022008 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 20289022008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26343221760).

20289022008 is an abundant number, since it is smaller than the sum of its proper divisors (32397421512).

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

20289022008 is a wasteful number, since it uses less digits than its factorization.

20289022008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197 (or 1193 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 20289022008 in words is "twenty billion, two hundred eighty-nine million, twenty-two thousand, eight".