20256156 has 60 divisors (see below), whose sum is σ = 53564280. Its totient is φ = 6674400.

The previous prime is 20256151. The next prime is 20256157. The reversal of 20256156 is 65165202.

20256156 is a `hidden beast` number, since 20 + 25 + 615 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256151) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32415 + ... + 33033.

It is an arithmetic number, because the mean of its divisors is an integer number (892738).

Almost surely, 2^20256156 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 20256156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26782140).

20256156 is an abundant number, since it is smaller than the sum of its proper divisors (33308124).

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

20256156 is a wasteful number, since it uses less digits than its factorization.

20256156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 725 counting only the distinct ones).

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

The square root of 20256156 is about 4500.6839480239. The cubic root of 20256156 is about 272.5957063595.

The spelling of 20256156 in words is "twenty million, two hundred fifty-six thousand, one hundred fifty-six".