220789881 has 45 divisors (see below), whose sum is σ = 359978751. Its totient is φ = 134800848.

The previous prime is 220789867. The next prime is 220789883. The reversal of 220789881 is 188987022.

It is a happy number.

The square root of 220789881 is 14859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 188128656 = 5715^2 + 13716^2 .

It is not a de Polignac number, because 220789881 - 2⁹ = 220789369 is a prime.

It is a super-2 number, since 2×220789881² = 97496343103988322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220789883) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1738440 + ... + 1738566.

Almost surely, 2^220789881 is an apocalyptic number.

220789881 is the 14859-th square number.

220789881 is the 7430-th centered octagonal number.

It is an amenable number.

220789881 is a deficient number, since it is larger than the sum of its proper divisors (139188870).

220789881 is an equidigital number, since it uses as much as digits as its factorization.

220789881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The cubic root of 220789881 is about 604.4026898513.

The spelling of 220789881 in words is "two hundred twenty million, seven hundred eighty-nine thousand, eight hundred eighty-one".