20563256 has 16 divisors (see below), whose sum is σ = 44064240. Its totient is φ = 8812800.

The previous prime is 20563237. The next prime is 20563259. The reversal of 20563256 is 65236502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563259) 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, 183545 + ... + 183656.

It is an arithmetic number, because the mean of its divisors is an integer number (2754015).

Almost surely, 2^20563256 is an apocalyptic number.

It is an amenable number.

20563256 is an abundant number, since it is smaller than the sum of its proper divisors (23500984).

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

20563256 is a wasteful number, since it uses less digits than its factorization.

20563256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367214 (or 367210 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 20563256 is about 4534.6726452965. The cubic root of 20563256 is about 273.9663943725.

Adding to 20563256 its reverse (65236502), we get a palindrome (85799758).

The spelling of 20563256 in words is "twenty million, five hundred sixty-three thousand, two hundred fifty-six".