20565526 has 4 divisors (see below), whose sum is σ = 30848292. Its totient is φ = 10282762.

The previous prime is 20565521. The next prime is 20565527. The reversal of 20565526 is 62556502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62556502 = 2 ⋅31278251.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565521) 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, 5141380 + ... + 5141383.

It is an arithmetic number, because the mean of its divisors is an integer number (7712073).

Almost surely, 2^20565526 is an apocalyptic number.

20565526 is a deficient number, since it is larger than the sum of its proper divisors (10282766).

20565526 is a wasteful number, since it uses less digits than its factorization.

20565526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10282765.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 20565526 is about 4534.9229320905. The cubic root of 20565526 is about 273.9764751501.

The spelling of 20565526 in words is "twenty million, five hundred sixty-five thousand, five hundred twenty-six".