20605572 has 36 divisors (see below), whose sum is σ = 56094220. Its totient is φ = 6340032.

The previous prime is 20605561. The next prime is 20605577. The reversal of 20605572 is 27550602.

20605572 is a `hidden beast` number, since 2 + 0 + 605 + 57 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2509056 + 18096516 = 1584^2 + 4254^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21547 + ... + 22482.

Almost surely, 2^20605572 is an apocalyptic number.

It is an amenable number.

20605572 is an abundant number, since it is smaller than the sum of its proper divisors (35488648).

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

20605572 is a wasteful number, since it uses less digits than its factorization.

20605572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44052 (or 44047 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20605572 is about 4539.3360748021. The cubic root of 20605572 is about 274.1541924318.

The spelling of 20605572 in words is "twenty million, six hundred five thousand, five hundred seventy-two".