20561041 has 8 divisors (see below), whose sum is σ = 21855744. Its totient is φ = 19275840.

The previous prime is 20561033. The next prime is 20561053. The reversal of 20561041 is 14016502.

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 20561041 - 2³ = 20561033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20561081) 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, 2376 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (2731968).

Almost surely, 2^20561041 is an apocalyptic number.

It is an amenable number.

20561041 is a deficient number, since it is larger than the sum of its proper divisors (1294703).

20561041 is a wasteful number, since it uses less digits than its factorization.

20561041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4751.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20561041 is about 4534.4284094029. The cubic root of 20561041 is about 273.9565571276.

Adding to 20561041 its reverse (14016502), we get a palindrome (34577543).

The spelling of 20561041 in words is "twenty million, five hundred sixty-one thousand, forty-one".