20818377216 has 960 divisors, whose sum is σ = 81473356800. Its totient is φ = 5123948544.

The previous prime is 20818377193. The next prime is 20818377221. The reversal of 20818377216 is 61277381802.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 310722015 + ... + 310722081.

It is an arithmetic number, because the mean of its divisors is an integer number (84868080).

Almost surely, 2^20818377216 is an apocalyptic number.

20818377216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20818377216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40736678400).

20818377216 is an abundant number, since it is smaller than the sum of its proper divisors (60654979584).

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

20818377216 is a wasteful number, since it uses less digits than its factorization.

20818377216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 20818377216 in words is "twenty billion, eight hundred eighteen million, three hundred seventy-seven thousand, two hundred sixteen".