20544764643 has 16 divisors (see below), whose sum is σ = 32777972640. Its totient is φ = 12642931872.

The previous prime is 20544764641. The next prime is 20544764659. The reversal of 20544764643 is 34646744502.

20544764643 is a `hidden beast` number, since 2 + 0 + 544 + 7 + 64 + 6 + 43 = 666.

It is not a de Polignac number, because 20544764643 - 2¹ = 20544764641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20544764641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29265696 + ... + 29266397.

It is an arithmetic number, because the mean of its divisors is an integer number (2048623290).

Almost surely, 2^20544764643 is an apocalyptic number.

20544764643 is a deficient number, since it is larger than the sum of its proper divisors (12233207997).

20544764643 is a wasteful number, since it uses less digits than its factorization.

20544764643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58532115 (or 58532109 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 45.

The spelling of 20544764643 in words is "twenty billion, five hundred forty-four million, seven hundred sixty-four thousand, six hundred forty-three".