20543642631023 has 4 divisors (see below), whose sum is σ = 20543658169800. Its totient is φ = 20543627092248.

The previous prime is 20543642630999. The next prime is 20543642631067. The reversal of 20543642631023 is 32013624634502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20543642631023 - 2³² = 20539347663727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543642631923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5580740 + ... + 8498937.

It is an arithmetic number, because the mean of its divisors is an integer number (5135914542450).

Almost surely, 2^{20543642631023} is an apocalyptic number.

20543642631023 is a deficient number, since it is larger than the sum of its proper divisors (15538777).

20543642631023 is a wasteful number, since it uses less digits than its factorization.

20543642631023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15538776.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 20543642631023 in words is "twenty trillion, five hundred forty-three billion, six hundred forty-two million, six hundred thirty-one thousand, twenty-three".