20057856 has 216 divisors, whose sum is σ = 68506704. Its totient is φ = 5160960.

The previous prime is 20057833. The next prime is 20057887. The reversal of 20057856 is 65875002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 489196 + ... + 489236.

Almost surely, 2^20057856 is an apocalyptic number.

20057856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20057856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34253352).

20057856 is an abundant number, since it is smaller than the sum of its proper divisors (48448848).

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

20057856 is a wasteful number, since it uses less digits than its factorization.

20057856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 20057856 is about 4478.5997811816. The cubic root of 20057856 is about 271.7032519177.

The spelling of 20057856 in words is "twenty million, fifty-seven thousand, eight hundred fifty-six".