20164256 has 24 divisors (see below), whose sum is σ = 45370080. Its totient is φ = 8641728.

The previous prime is 20164247. The next prime is 20164259. The reversal of 20164256 is 65246102.

It is not an unprimeable number, because it can be changed into a prime (20164259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44786 + ... + 45233.

It is an arithmetic number, because the mean of its divisors is an integer number (1890420).

Almost surely, 2^20164256 is an apocalyptic number.

It is an amenable number.

20164256 is an abundant number, since it is smaller than the sum of its proper divisors (25205824).

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

20164256 is an equidigital number, since it uses as much as digits as its factorization.

20164256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90036 (or 90028 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20164256 is about 4490.4627823867. The cubic root of 20164256 is about 272.1828355498.

It can be divided in two parts, 20164 and 256, that multiplied together give a square (5161984 = 2272²).

The spelling of 20164256 in words is "twenty million, one hundred sixty-four thousand, two hundred fifty-six".