20169670128 has 160 divisors (see below), whose sum is σ = 56963782656. Its totient is φ = 6124683264.

The previous prime is 20169670127. The next prime is 20169670141. The reversal of 20169670128 is 82107696102.

It is a self number, because there is not a number n which added to its sum of digits gives 20169670128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20169670121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3962401 + ... + 3967487.

Almost surely, 2^20169670128 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 20169670128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28481891328).

20169670128 is an abundant number, since it is smaller than the sum of its proper divisors (36794112528).

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

20169670128 is a wasteful number, since it uses less digits than its factorization.

20169670128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271 (or 5265 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20169670128 in words is "twenty billion, one hundred sixty-nine million, six hundred seventy thousand, one hundred twenty-eight".