20561063 has 4 divisors (see below), whose sum is σ = 20570520. Its totient is φ = 20551608.

The previous prime is 20561053. The next prime is 20561069. The reversal of 20561063 is 36016502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20561063 - 2⁶ = 20560999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (5142630).

Almost surely, 2^20561063 is an apocalyptic number.

20561063 is a deficient number, since it is larger than the sum of its proper divisors (9457).

20561063 is an equidigital number, since it uses as much as digits as its factorization.

20561063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20561063 is about 4534.4308352868. The cubic root of 20561063 is about 273.9566548373.

Adding to 20561063 its reverse (36016502), we get a palindrome (56577565).

The spelling of 20561063 in words is "twenty million, five hundred sixty-one thousand, sixty-three".