20183856 has 160 divisors (see below), whose sum is σ = 67043328. Its totient is φ = 5080320.

The previous prime is 20183851. The next prime is 20183869. The reversal of 20183856 is 65838102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20183851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158865 + ... + 158991.

Almost surely, 2^20183856 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 20183856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33521664).

20183856 is an abundant number, since it is smaller than the sum of its proper divisors (46859472).

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

20183856 is a wasteful number, since it uses less digits than its factorization.

20183856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20183856 is about 4492.6446554340. The cubic root of 20183856 is about 272.2709957744.

The spelling of 20183856 in words is "twenty million, one hundred eighty-three thousand, eight hundred fifty-six".