20177289216 has 408 divisors, whose sum is σ = 69465532864. Its totient is φ = 5733089280.

The previous prime is 20177289199. The next prime is 20177289289. The reversal of 20177289216 is 61298277102.

It is a happy number.

It is a super-2 number, since 2×20177289216² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111476646 + ... + 111476826.

Almost surely, 2^20177289216 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 20177289216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34732766432).

20177289216 is an abundant number, since it is smaller than the sum of its proper divisors (49288243648).

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

20177289216 is an frugal number, since it uses more digits than its factorization.

20177289216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 20177289216 in words is "twenty billion, one hundred seventy-seven million, two hundred eighty-nine thousand, two hundred sixteen".