220161816 has 192 divisors, whose sum is σ = 728582400. Its totient is φ = 58662144.

The previous prime is 220161811. The next prime is 220161827. The reversal of 220161816 is 618161022.

It is a self number, because there is not a number n which added to its sum of digits gives 220161816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220161811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 794670 + ... + 794946.

It is an arithmetic number, because the mean of its divisors is an integer number (3794700).

Almost surely, 2^220161816 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 220161816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364291200).

220161816 is an abundant number, since it is smaller than the sum of its proper divisors (508420584).

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

220161816 is a wasteful number, since it uses less digits than its factorization.

220161816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 220161816 is about 14837.8507877657. The cubic root of 220161816 is about 603.8290453712.

It can be divided in two parts, 22016 and 1816, that added together give a palindrome (23832).

The spelling of 220161816 in words is "two hundred twenty million, one hundred sixty-one thousand, eight hundred sixteen".