20985533 has 8 divisors (see below), whose sum is σ = 21418560. Its totient is φ = 20555200.

The previous prime is 20985521. The next prime is 20985551. The reversal of 20985533 is 33558902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20985533 - 2¹⁴ = 20969149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20985493 and 20985502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23216 + ... + 24102.

It is an arithmetic number, because the mean of its divisors is an integer number (2677320).

Almost surely, 2^20985533 is an apocalyptic number.

It is an amenable number.

20985533 is a deficient number, since it is larger than the sum of its proper divisors (433027).

20985533 is an equidigital number, since it uses as much as digits as its factorization.

20985533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20985533 is about 4580.9969438977. The cubic root of 20985533 is about 275.8290485507.

The spelling of 20985533 in words is "twenty million, nine hundred eighty-five thousand, five hundred thirty-three".