20169771768 has 96 divisors (see below), whose sum is σ = 56706249600. Its totient is φ = 6716543328.

The previous prime is 20169771751. The next prime is 20169771833. The reversal of 20169771768 is 86717796102.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2178493 + ... + 2187731.

It is an arithmetic number, because the mean of its divisors is an integer number (590690100).

Almost surely, 2^20169771768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20169771768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28353124800).

20169771768 is an abundant number, since it is smaller than the sum of its proper divisors (36536477832).

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

20169771768 is a wasteful number, since it uses less digits than its factorization.

20169771768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10383 (or 10367 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 20169771768 in words is "twenty billion, one hundred sixty-nine million, seven hundred seventy-one thousand, seven hundred sixty-eight".