20778903166 has 8 divisors (see below), whose sum is σ = 35620976880. Its totient is φ = 8905244208.

The previous prime is 20778903143. The next prime is 20778903193. The reversal of 20778903166 is 66130987702.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742103671 + ... + 742103698.

It is an arithmetic number, because the mean of its divisors is an integer number (4452622110).

Almost surely, 2^20778903166 is an apocalyptic number.

20778903166 is a deficient number, since it is larger than the sum of its proper divisors (14842073714).

20778903166 is a wasteful number, since it uses less digits than its factorization.

20778903166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484207378.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 20778903166 in words is "twenty billion, seven hundred seventy-eight million, nine hundred three thousand, one hundred sixty-six".