220908769 has 9 divisors (see below), whose sum is σ = 224764627. Its totient is φ = 217118704.

The previous prime is 220908757. The next prime is 220908781. The reversal of 220908769 is 967809022.

It is a happy number.

The square root of 220908769 is 14863.

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

220908769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (220908757) and next prime (220908781).

It can be written as a sum of positive squares in only one way, i.e., 42419169 + 178489600 = 6513^2 + 13360^2 .

It is not a de Polignac number, because 220908769 - 2⁷ = 220908641 is a prime.

It is a super-2 number, since 2×220908769² = 97601368442190722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220908739) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1322724 + ... + 1322890.

Almost surely, 2^220908769 is an apocalyptic number.

220908769 is the 14863-rd square number.

220908769 is the 7432-nd centered octagonal number.

It is an amenable number.

220908769 is a deficient number, since it is larger than the sum of its proper divisors (3855858).

220908769 is an frugal number, since it uses more digits than its factorization.

220908769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The cubic root of 220908769 is about 604.5111539608.

The spelling of 220908769 in words is "two hundred twenty million, nine hundred eight thousand, seven hundred sixty-nine".