20543671653 has 16 divisors (see below), whose sum is σ = 28153403520. Its totient is φ = 13315427136.

The previous prime is 20543671649. The next prime is 20543671721. The reversal of 20543671653 is 35617634502.

It is not a de Polignac number, because 20543671653 - 2² = 20543671649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543671633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76251 + ... + 216567.

It is an arithmetic number, because the mean of its divisors is an integer number (1759587720).

Almost surely, 2^20543671653 is an apocalyptic number.

It is an amenable number.

20543671653 is a deficient number, since it is larger than the sum of its proper divisors (7609731867).

20543671653 is a wasteful number, since it uses less digits than its factorization.

20543671653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141676.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 20543671653 in words is "twenty billion, five hundred forty-three million, six hundred seventy-one thousand, six hundred fifty-three".