20985357 has 24 divisors (see below), whose sum is σ = 30028320. Its totient is φ = 13020000.

The previous prime is 20985337. The next prime is 20985373. The reversal of 20985357 is 75358902.

It is not a de Polignac number, because 20985357 - 2⁷ = 20985229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83482 + ... + 83732.

It is an arithmetic number, because the mean of its divisors is an integer number (1251180).

Almost surely, 2^20985357 is an apocalyptic number.

It is an amenable number.

20985357 is a deficient number, since it is larger than the sum of its proper divisors (9042963).

20985357 is a wasteful number, since it uses less digits than its factorization.

20985357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 20985357 is about 4580.9777340651. The cubic root of 20985357 is about 275.8282774473.

The spelling of 20985357 in words is "twenty million, nine hundred eighty-five thousand, three hundred fifty-seven".