20161577216 has 144 divisors (see below), whose sum is σ = 45068728320. Its totient is φ = 8923146240.

The previous prime is 20161577213. The next prime is 20161577239. The reversal of 20161577216 is 61277516102.

It is a self number, because there is not a number n which added to its sum of digits gives 20161577216.

It is not an unprimeable number, because it can be changed into a prime (20161577213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45925925 + ... + 45926363.

It is an arithmetic number, because the mean of its divisors is an integer number (312977280).

Almost surely, 2^20161577216 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 20161577216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22534364160).

20161577216 is an abundant number, since it is smaller than the sum of its proper divisors (24907151104).

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

20161577216 is a wasteful number, since it uses less digits than its factorization.

20161577216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The spelling of 20161577216 in words is "twenty billion, one hundred sixty-one million, five hundred seventy-seven thousand, two hundred sixteen".