220720188 has 96 divisors (see below), whose sum is σ = 589881600. Its totient is φ = 63673344.

The previous prime is 220720153. The next prime is 220720211. The reversal of 220720188 is 881027022.

It is a happy number.

220720188 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334603 + ... + 335261.

It is an arithmetic number, because the mean of its divisors is an integer number (6144600).

Almost surely, 2^220720188 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 220720188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294940800).

220720188 is an abundant number, since it is smaller than the sum of its proper divisors (369161412).

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

220720188 is a wasteful number, since it uses less digits than its factorization.

220720188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 220720188 is about 14856.6546705508. The cubic root of 220720188 is about 604.3390893075.

The spelling of 220720188 in words is "two hundred twenty million, seven hundred twenty thousand, one hundred eighty-eight".