20723563589 has 16 divisors (see below), whose sum is σ = 21558279600. Its totient is φ = 19897092096.

The previous prime is 20723563583. The next prime is 20723563607. The reversal of 20723563589 is 98536532702.

It can be written as a sum of positive squares in 8 ways, for example, as 828461089 + 19895102500 = 28783^2 + 141050^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20723563589 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 (20723563583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6978497 + ... + 6981465.

It is an arithmetic number, because the mean of its divisors is an integer number (1347392475).

Almost surely, 2^20723563589 is an apocalyptic number.

20723563589 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20723563589 is a deficient number, since it is larger than the sum of its proper divisors (834716011).

20723563589 is a wasteful number, since it uses less digits than its factorization.

20723563589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264.

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 20723563589 in words is "twenty billion, seven hundred twenty-three million, five hundred sixty-three thousand, five hundred eighty-nine".