20385256 has 8 divisors (see below), whose sum is σ = 38222370. Its totient is φ = 10192624.

The previous prime is 20385251. The next prime is 20385257. The reversal of 20385256 is 65258302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 7896100 = 3534^2 + 2810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20385251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274071 + ... + 1274086.

Almost surely, 2^20385256 is an apocalyptic number.

It is an amenable number.

20385256 is a deficient number, since it is larger than the sum of its proper divisors (17837114).

20385256 is a wasteful number, since it uses less digits than its factorization.

20385256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548163 (or 2548159 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20385256 is about 4515.0034329998. The cubic root of 20385256 is about 273.1735982552.

Subtracting from 20385256 its sum of digits (31), we obtain a square (20385225 = 4515²).

The spelling of 20385256 in words is "twenty million, three hundred eighty-five thousand, two hundred fifty-six".