20764435543 has 2 divisors, whose sum is σ = 20764435544. Its totient is φ = 20764435542.

The previous prime is 20764435529. The next prime is 20764435577. The reversal of 20764435543 is 34553446702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20764435543 - 2⁹ = 20764435031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20764435543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20764430543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382217771 + 10382217772.

It is an arithmetic number, because the mean of its divisors is an integer number (10382217772).

Almost surely, 2^20764435543 is an apocalyptic number.

20764435543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764435543 is an equidigital number, since it uses as much as digits as its factorization.

20764435543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 43.

The spelling of 20764435543 in words is "twenty billion, seven hundred sixty-four million, four hundred thirty-five thousand, five hundred forty-three".