20048561 has 8 divisors (see below), whose sum is σ = 22174824. Its totient is φ = 18005760.

The previous prime is 20048551. The next prime is 20048579. The reversal of 20048561 is 16584002.

It can be written as a sum of positive squares in 4 ways, for example, as 6682225 + 13366336 = 2585^2 + 3656^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20048561 - 2¹⁰ = 20047537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20048561.

It is not an unprimeable number, because it can be changed into a prime (20048521) 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 in 7 ways as a sum of consecutive naturals, for example, 20360 + ... + 21321.

It is an arithmetic number, because the mean of its divisors is an integer number (2771853).

Almost surely, 2^20048561 is an apocalyptic number.

It is an amenable number.

20048561 is a deficient number, since it is larger than the sum of its proper divisors (2126263).

20048561 is a wasteful number, since it uses less digits than its factorization.

20048561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41731.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20048561 is about 4477.5619482035. The cubic root of 20048561 is about 271.6612754815.

The spelling of 20048561 in words is "twenty million, forty-eight thousand, five hundred sixty-one".