20494634688 has 224 divisors, whose sum is σ = 67849943040. Its totient is φ = 6009984000.

The previous prime is 20494634687. The next prime is 20494634701. The reversal of 20494634688 is 88643649402.

20494634688 is a `hidden beast` number, since 20 + 49 + 463 + 46 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20494634687) 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, 571858 + ... + 606638.

Almost surely, 2^20494634688 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 20494634688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33924971520).

20494634688 is an abundant number, since it is smaller than the sum of its proper divisors (47355308352).

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

20494634688 is a wasteful number, since it uses less digits than its factorization.

20494634688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34844 (or 34828 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 20494634688 in words is "twenty billion, four hundred ninety-four million, six hundred thirty-four thousand, six hundred eighty-eight".