20641120992 has 72 divisors (see below), whose sum is σ = 58834732320. Its totient is φ = 6864368640.

The previous prime is 20641120987. The next prime is 20641120993. The reversal of 20641120992 is 29902114602.

20641120992 is a `hidden beast` number, since 2 + 0 + 641 + 1 + 2 + 0 + 9 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641120993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40984 + ... + 207272.

It is an arithmetic number, because the mean of its divisors is an integer number (817149060).

Almost surely, 2^20641120992 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 20641120992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29417366160).

20641120992 is an abundant number, since it is smaller than the sum of its proper divisors (38193611328).

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

20641120992 is a wasteful number, since it uses less digits than its factorization.

20641120992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166736 (or 166725 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 20641120992 in words is "twenty billion, six hundred forty-one million, one hundred twenty thousand, nine hundred ninety-two".