20985337 has 2 divisors, whose sum is σ = 20985338. Its totient is φ = 20985336.

The previous prime is 20985319. The next prime is 20985373. The reversal of 20985337 is 73358902.

Together with next prime (20985373) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19395216 + 1590121 = 4404^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 20985337 - 2¹¹ = 20983289 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20985296 and 20985305.

It is not a weakly prime, because it can be changed into another prime (20985737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10492668 + 10492669.

It is an arithmetic number, because the mean of its divisors is an integer number (10492669).

Almost surely, 2^20985337 is an apocalyptic number.

It is an amenable number.

20985337 is a deficient number, since it is larger than the sum of its proper divisors (1).

20985337 is an equidigital number, since it uses as much as digits as its factorization.

20985337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20985337 is about 4580.9755511245. The cubic root of 20985337 is about 275.8281898216.

The spelling of 20985337 in words is "twenty million, nine hundred eighty-five thousand, three hundred thirty-seven".