20937589 has 2 divisors, whose sum is σ = 20937590. Its totient is φ = 20937588.

The previous prime is 20937571. The next prime is 20937619. The reversal of 20937589 is 98573902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 9090225 = 3442^2 + 3015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20937589 - 2¹⁷ = 20806517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20937529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10468794 + 10468795.

It is an arithmetic number, because the mean of its divisors is an integer number (10468795).

Almost surely, 2^20937589 is an apocalyptic number.

It is an amenable number.

20937589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20937589 is an equidigital number, since it uses as much as digits as its factorization.

20937589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20937589 is about 4575.7610295993. The cubic root of 20937589 is about 275.6188333899.

The spelling of 20937589 in words is "twenty million, nine hundred thirty-seven thousand, five hundred eighty-nine".