20985496 has 16 divisors (see below), whose sum is σ = 44969040. Its totient is φ = 8993760.

The previous prime is 20985493. The next prime is 20985511. The reversal of 20985496 is 69458902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187315 + ... + 187426.

It is an arithmetic number, because the mean of its divisors is an integer number (2810565).

Almost surely, 2^20985496 is an apocalyptic number.

It is an amenable number.

20985496 is an abundant number, since it is smaller than the sum of its proper divisors (23983544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20985496 is a wasteful number, since it uses less digits than its factorization.

20985496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374754 (or 374750 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 20985496 is about 4580.9929054737. The cubic root of 20985496 is about 275.8288864441.

The spelling of 20985496 in words is "twenty million, nine hundred eighty-five thousand, four hundred ninety-six".