20708641384 has 8 divisors (see below), whose sum is σ = 38828702610. Its totient is φ = 10354320688.

The previous prime is 20708641381. The next prime is 20708641403. The reversal of 20708641384 is 48314680702.

It can be written as a sum of positive squares in only one way, i.e., 11885796484 + 8822844900 = 109022^2 + 93930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×20708641384³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20708641384.

It is not an unprimeable number, because it can be changed into a prime (20708641381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1294290079 + ... + 1294290094.

Almost surely, 2^20708641384 is an apocalyptic number.

It is an amenable number.

20708641384 is a deficient number, since it is larger than the sum of its proper divisors (18120061226).

20708641384 is a wasteful number, since it uses less digits than its factorization.

20708641384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588580179 (or 2588580175 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 20708641384 in words is "twenty billion, seven hundred eight million, six hundred forty-one thousand, three hundred eighty-four".