20393856 has 160 divisors (see below), whose sum is σ = 69608880. Its totient is φ = 5806080.

The previous prime is 20393839. The next prime is 20393861. The reversal of 20393856 is 65839302.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20393856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72436 + ... + 72716.

Almost surely, 2^20393856 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 20393856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34804440).

20393856 is an abundant number, since it is smaller than the sum of its proper divisors (49215024).

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

20393856 is an equidigital number, since it uses as much as digits as its factorization.

20393856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 20393856 is about 4515.9557128032. The cubic root of 20393856 is about 273.2120077582.

The spelling of 20393856 in words is "twenty million, three hundred ninety-three thousand, eight hundred fifty-six".