20747266789 has 2 divisors, whose sum is σ = 20747266790. Its totient is φ = 20747266788.

The previous prime is 20747266763. The next prime is 20747266819. The reversal of 20747266789 is 98766274702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20503376100 + 243890689 = 143190^2 + 15617^2 .

It is a cyclic number.

It is not a de Polignac number, because 20747266789 - 2¹⁹ = 20746742501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20747266759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373633394 + 10373633395.

It is an arithmetic number, because the mean of its divisors is an integer number (10373633395).

Almost surely, 2^20747266789 is an apocalyptic number.

It is an amenable number.

20747266789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747266789 is an equidigital number, since it uses as much as digits as its factorization.

20747266789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 58.

The spelling of 20747266789 in words is "twenty billion, seven hundred forty-seven million, two hundred sixty-six thousand, seven hundred eighty-nine".