20635560668 has 12 divisors (see below), whose sum is σ = 36124998000. Its totient is φ = 10314132672.

The previous prime is 20635560623. The next prime is 20635560677. The reversal of 20635560668 is 86606553602.

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, 899168 + ... + 921831.

It is an arithmetic number, because the mean of its divisors is an integer number (3010416500).

Almost surely, 2^20635560668 is an apocalyptic number.

It is an amenable number.

20635560668 is a deficient number, since it is larger than the sum of its proper divisors (15489437332).

20635560668 is a wasteful number, since it uses less digits than its factorization.

20635560668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823836 (or 1823834 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 20635560668 in words is "twenty billion, six hundred thirty-five million, five hundred sixty thousand, six hundred sixty-eight".