20271236216 has 128 divisors (see below), whose sum is σ = 47964994560. Its totient is φ = 7802265600.

The previous prime is 20271236179. The next prime is 20271236221. The reversal of 20271236216 is 61263217202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19853786 + ... + 19854806.

It is an arithmetic number, because the mean of its divisors is an integer number (374726520).

Almost surely, 2^20271236216 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 20271236216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23982497280).

20271236216 is an abundant number, since it is smaller than the sum of its proper divisors (27693758344).

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

20271236216 is a wasteful number, since it uses less digits than its factorization.

20271236216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The spelling of 20271236216 in words is "twenty billion, two hundred seventy-one million, two hundred thirty-six thousand, two hundred sixteen".