20651779606 has 8 divisors (see below), whose sum is σ = 31200530760. Its totient is φ = 10251602688.

The previous prime is 20651779591. The next prime is 20651779627. The reversal of 20651779606 is 60697715602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20651779606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37143211 + ... + 37143766.

It is an arithmetic number, because the mean of its divisors is an integer number (3900066345).

Almost surely, 2^20651779606 is an apocalyptic number.

20651779606 is a deficient number, since it is larger than the sum of its proper divisors (10548751154).

20651779606 is a wasteful number, since it uses less digits than its factorization.

20651779606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74287118.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 20651779606 in words is "twenty billion, six hundred fifty-one million, seven hundred seventy-nine thousand, six hundred six".