220217979 has 4 divisors (see below), whose sum is σ = 293623976. Its totient is φ = 146811984.

The previous prime is 220217971. The next prime is 220217981. The reversal of 220217979 is 979712022.

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

It is not a de Polignac number, because 220217979 - 2³ = 220217971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220217971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36702994 + ... + 36702999.

It is an arithmetic number, because the mean of its divisors is an integer number (73405994).

Almost surely, 2^220217979 is an apocalyptic number.

220217979 is a deficient number, since it is larger than the sum of its proper divisors (73405997).

220217979 is an equidigital number, since it uses as much as digits as its factorization.

220217979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73405996.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 220217979 is about 14839.7432255413. The cubic root of 220217979 is about 603.8803863470.

The spelling of 220217979 in words is "two hundred twenty million, two hundred seventeen thousand, nine hundred seventy-nine".