20681953092 has 72 divisors (see below), whose sum is σ = 55373710392. Its totient is φ = 6486220800.

The previous prime is 20681953091. The next prime is 20681953099. The reversal of 20681953092 is 29035918602.

20681953092 is a `hidden beast` number, since 20 + 6 + 8 + 1 + 9 + 530 + 92 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 875331396 + 19806621696 = 29586^2 + 140736^2 .

It is not an unprimeable number, because it can be changed into a prime (20681953091) 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 23 ways as a sum of consecutive naturals, for example, 3375792 + ... + 3381912.

It is an arithmetic number, because the mean of its divisors is an integer number (769079311).

Almost surely, 2^20681953092 is an apocalyptic number.

It is an amenable number.

20681953092 is an abundant number, since it is smaller than the sum of its proper divisors (34691757300).

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

20681953092 is a wasteful number, since it uses less digits than its factorization.

20681953092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11669 (or 11664 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 20681953092 in words is "twenty billion, six hundred eighty-one million, nine hundred fifty-three thousand, ninety-two".