20553256 has 8 divisors (see below), whose sum is σ = 38537370. Its totient is φ = 10276624.

The previous prime is 20553251. The next prime is 20553263. The reversal of 20553256 is 65235502.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 2149156 = 4290^2 + 1466^2 .

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 (20553251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284571 + ... + 1284586.

Almost surely, 2^20553256 is an apocalyptic number.

It is an amenable number.

20553256 is a deficient number, since it is larger than the sum of its proper divisors (17984114).

20553256 is a wasteful number, since it uses less digits than its factorization.

20553256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569163 (or 2569159 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 20553256 is about 4533.5698957885. The cubic root of 20553256 is about 273.9219768255.

Adding to 20553256 its reverse (65235502), we get a palindrome (85788758).

The spelling of 20553256 in words is "twenty million, five hundred fifty-three thousand, two hundred fifty-six".