20985598 has 8 divisors (see below), whose sum is σ = 31672008. Its totient is φ = 10428264.

The previous prime is 20985593. The next prime is 20985617. The reversal of 20985598 is 89558902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31861 + ... + 32512.

It is an arithmetic number, because the mean of its divisors is an integer number (3959001).

Almost surely, 2^20985598 is an apocalyptic number.

20985598 is a deficient number, since it is larger than the sum of its proper divisors (10686410).

20985598 is a wasteful number, since it uses less digits than its factorization.

20985598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64538.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 20985598 is about 4581.0040384178. The cubic root of 20985598 is about 275.8293333321.

The spelling of 20985598 in words is "twenty million, nine hundred eighty-five thousand, five hundred ninety-eight".