20702436589 has 2 divisors, whose sum is σ = 20702436590. Its totient is φ = 20702436588.

The previous prime is 20702436571. The next prime is 20702436611. The reversal of 20702436589 is 98563420702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11425472100 + 9276964489 = 106890^2 + 96317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20702436589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20702436529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10351218294 + 10351218295.

It is an arithmetic number, because the mean of its divisors is an integer number (10351218295).

Almost surely, 2^20702436589 is an apocalyptic number.

It is an amenable number.

20702436589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20702436589 is an equidigital number, since it uses as much as digits as its factorization.

20702436589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 20702436589 in words is "twenty billion, seven hundred two million, four hundred thirty-six thousand, five hundred eighty-nine".