20168770734 has 72 divisors (see below), whose sum is σ = 50922919008. Its totient is φ = 5752373760.

The previous prime is 20168770723. The next prime is 20168770751. The reversal of 20168770734 is 43707786102.

It is a self number, because there is not a number n which added to its sum of digits gives 20168770734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 489099 + ... + 528729.

It is an arithmetic number, because the mean of its divisors is an integer number (707262764).

Almost surely, 2^20168770734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20168770734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25461459504).

20168770734 is an abundant number, since it is smaller than the sum of its proper divisors (30754148274).

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

20168770734 is a wasteful number, since it uses less digits than its factorization.

20168770734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40230 (or 40220 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 20168770734 in words is "twenty billion, one hundred sixty-eight million, seven hundred seventy thousand, seven hundred thirty-four".