20638776316 has 24 divisors (see below), whose sum is σ = 36310117536. Its totient is φ = 10264558080.

The previous prime is 20638776281. The next prime is 20638776317. The reversal of 20638776316 is 61367783602.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20638776316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20638776317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843000 + ... + 867136.

It is an arithmetic number, because the mean of its divisors is an integer number (1512921564).

Almost surely, 2^20638776316 is an apocalyptic number.

It is an amenable number.

20638776316 is a deficient number, since it is larger than the sum of its proper divisors (15671341220).

20638776316 is a wasteful number, since it uses less digits than its factorization.

20638776316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25269 (or 25267 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 20638776316 in words is "twenty billion, six hundred thirty-eight million, seven hundred seventy-six thousand, three hundred sixteen".