220720189 has 4 divisors (see below), whose sum is σ = 228331260. Its totient is φ = 213109120.

The previous prime is 220720153. The next prime is 220720211. The reversal of 220720189 is 981027022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40220964 + 180499225 = 6342^2 + 13435^2 .

It is a cyclic number.

It is not a de Polignac number, because 220720189 - 2²¹ = 218623037 is a prime.

It is a super-3 number, since 3×220720189³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220720189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220720889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3805492 + ... + 3805549.

It is an arithmetic number, because the mean of its divisors is an integer number (57082815).

Almost surely, 2^220720189 is an apocalyptic number.

220720189 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

220720189 is a deficient number, since it is larger than the sum of its proper divisors (7611071).

220720189 is an equidigital number, since it uses as much as digits as its factorization.

220720189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611070.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 220720189 is about 14856.6547042058. The cubic root of 220720189 is about 604.3390902202.

The spelling of 220720189 in words is "two hundred twenty million, seven hundred twenty thousand, one hundred eighty-nine".