20561152 has 18 divisors (see below), whose sum is σ = 41042498. Its totient is φ = 10280448.

The previous prime is 20561147. The next prime is 20561171. The reversal of 20561152 is 25116502.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 7485696 = 3616^2 + 2736^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 39903 + ... + 40414.

Almost surely, 2^20561152 is an apocalyptic number.

It is an amenable number.

20561152 is a deficient number, since it is larger than the sum of its proper divisors (20481346).

20561152 is an frugal number, since it uses more digits than its factorization.

20561152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80333 (or 80319 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20561152 is about 4534.4406490768. The cubic root of 20561152 is about 273.9570501170.

Adding to 20561152 its reverse (25116502), we get a palindrome (45677654).

The spelling of 20561152 in words is "twenty million, five hundred sixty-one thousand, one hundred fifty-two".