20561006 has 8 divisors (see below), whose sum is σ = 30882600. Its totient is φ = 10266808.

The previous prime is 20560999. The next prime is 20561017. The reversal of 20561006 is 60016502.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4856 + ... + 8043.

It is an arithmetic number, because the mean of its divisors is an integer number (3860325).

Almost surely, 2^20561006 is an apocalyptic number.

20561006 is a deficient number, since it is larger than the sum of its proper divisors (10321594).

20561006 is a wasteful number, since it uses less digits than its factorization.

20561006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20561006 is about 4534.4245500394. The cubic root of 20561006 is about 273.9564016801.

Adding to 20561006 its reverse (60016502), we get a palindrome (80577508).

The spelling of 20561006 in words is "twenty million, five hundred sixty-one thousand, six".