20712589 has 2 divisors, whose sum is σ = 20712590. Its totient is φ = 20712588.

The previous prime is 20712577. The next prime is 20712607. The reversal of 20712589 is 98521702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 5244100 = 3933^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712589 - 2⁹ = 20712077 is a prime.

It is a super-2 number, since 2×20712589² = 858022686165842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20712089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356294 + 10356295.

It is an arithmetic number, because the mean of its divisors is an integer number (10356295).

Almost surely, 2^20712589 is an apocalyptic number.

It is an amenable number.

20712589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712589 is an equidigital number, since it uses as much as digits as its factorization.

20712589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20712589 is about 4551.1085462775. The cubic root of 20712589 is about 274.6279884412.

The spelling of 20712589 in words is "twenty million, seven hundred twelve thousand, five hundred eighty-nine".