20556572 has 12 divisors (see below), whose sum is σ = 37538256. Its totient is φ = 9831360.

The previous prime is 20556551. The next prime is 20556607. The reversal of 20556572 is 27565502.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 111629 + ... + 111812.

It is an arithmetic number, because the mean of its divisors is an integer number (3128188).

Almost surely, 2^20556572 is an apocalyptic number.

It is an amenable number.

20556572 is a deficient number, since it is larger than the sum of its proper divisors (16981684).

20556572 is a wasteful number, since it uses less digits than its factorization.

20556572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223468 (or 223466 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 20556572 is about 4533.9355972488. The cubic root of 20556572 is about 273.9367072804.

The spelling of 20556572 in words is "twenty million, five hundred fifty-six thousand, five hundred seventy-two".