20156256 has 96 divisors (see below), whose sum is σ = 60328800. Its totient is φ = 6543360.

The previous prime is 20156243. The next prime is 20156281. The reversal of 20156256 is 65265102.

20156256 is a `hidden beast` number, since 20 + 15 + 625 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35140 + ... + 35708.

It is an arithmetic number, because the mean of its divisors is an integer number (628425).

Almost surely, 2^20156256 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 20156256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30164400).

20156256 is an abundant number, since it is smaller than the sum of its proper divisors (40172544).

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

20156256 is a wasteful number, since it uses less digits than its factorization.

20156256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 615 counting only the distinct ones).

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

The square root of 20156256 is about 4489.5719172322. The cubic root of 20156256 is about 272.1468353669.

The spelling of 20156256 in words is "twenty million, one hundred fifty-six thousand, two hundred fifty-six".