20537289 has 6 divisors (see below), whose sum is σ = 29664986. Its totient is φ = 13691520.

The previous prime is 20537267. The next prime is 20537311. The reversal of 20537289 is 98273502.

It is a happy number.

20537289 is a `hidden beast` number, since 205 + 372 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (20537267) and next prime (20537311).

It can be written as a sum of positive squares in only one way, i.e., 16064064 + 4473225 = 4008^2 + 2115^2 .

It is not a de Polignac number, because 20537289 - 2¹¹ = 20535241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20537219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1140952 + ... + 1140969.

Almost surely, 2^20537289 is an apocalyptic number.

It is an amenable number.

20537289 is a deficient number, since it is larger than the sum of its proper divisors (9127697).

20537289 is a wasteful number, since it uses less digits than its factorization.

20537289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281927 (or 2281924 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20537289 is about 4531.8085793643. The cubic root of 20537289 is about 273.8510254512.

The spelling of 20537289 in words is "twenty million, five hundred thirty-seven thousand, two hundred eighty-nine".