20788068666 has 32 divisors (see below), whose sum is σ = 43051176000. Its totient is φ = 6683976320.

The previous prime is 20788068661. The next prime is 20788068667. The reversal of 20788068666 is 66686088702.

It is not an unprimeable number, because it can be changed into a prime (20788068661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125581 + ... + 239471.

It is an arithmetic number, because the mean of its divisors is an integer number (1345349250).

Almost surely, 2^20788068666 is an apocalyptic number.

20788068666 is an abundant number, since it is smaller than the sum of its proper divisors (22263107334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20788068666 is a wasteful number, since it uses less digits than its factorization.

20788068666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114974.

The product of its (nonzero) digits is 9289728, while the sum is 57.

The spelling of 20788068666 in words is "twenty billion, seven hundred eighty-eight million, sixty-eight thousand, six hundred sixty-six".