20687056992 has 192 divisors, whose sum is σ = 69462973440. Its totient is φ = 5867209728.

The previous prime is 20687056991. The next prime is 20687057021. The reversal of 20687056992 is 29965078602.

20687056992 is a `hidden beast` number, since 2 + 0 + 6 + 8 + 70 + 569 + 9 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687056991) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 816093 + ... + 841059.

It is an arithmetic number, because the mean of its divisors is an integer number (361786320).

Almost surely, 2^20687056992 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 20687056992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34731486720).

20687056992 is an abundant number, since it is smaller than the sum of its proper divisors (48775916448).

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

20687056992 is a wasteful number, since it uses less digits than its factorization.

20687056992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25130 (or 25116 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 20687056992 in words is "twenty billion, six hundred eighty-seven million, fifty-six thousand, nine hundred ninety-two".