20849856 has 84 divisors (see below), whose sum is σ = 57506616. Its totient is φ = 6666240.

The previous prime is 20849839. The next prime is 20849903. The reversal of 20849856 is 65894802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184456 + ... + 184568.

Almost surely, 2^20849856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20849856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28753308).

20849856 is an abundant number, since it is smaller than the sum of its proper divisors (36656760).

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

20849856 is a wasteful number, since it uses less digits than its factorization.

20849856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20849856 is about 4566.1642546014. The cubic root of 20849856 is about 275.2333270438.

The spelling of 20849856 in words is "twenty million, eight hundred forty-nine thousand, eight hundred fifty-six".