20165256 has 96 divisors (see below), whose sum is σ = 57283200. Its totient is φ = 6403200.

The previous prime is 20165239. The next prime is 20165261. The reversal of 20165256 is 65256102.

20165256 = T₁₂₁ + T₁₂₂ + ... + T₄₉₆.

20165256 is a `hidden beast` number, since 2 + 0 + 1 + 652 + 5 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199606 + ... + 199706.

It is an arithmetic number, because the mean of its divisors is an integer number (596700).

Almost surely, 2^20165256 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 20165256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28641600).

20165256 is an abundant number, since it is smaller than the sum of its proper divisors (37117944).

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

20165256 is a wasteful number, since it uses less digits than its factorization.

20165256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20165256 is about 4490.5741281043. The cubic root of 20165256 is about 272.1873349031.

The spelling of 20165256 in words is "twenty million, one hundred sixty-five thousand, two hundred fifty-six".