220989947 has 4 divisors (see below), whose sum is σ = 228610320. Its totient is φ = 213369576.

The previous prime is 220989929. The next prime is 220989961. The reversal of 220989947 is 749989022.

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

It is a cyclic number.

It is not a de Polignac number, because 220989947 - 2²⁶ = 153881083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220989895 and 220989904.

It is not an unprimeable number, because it can be changed into a prime (220989997) 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, 3810143 + ... + 3810200.

It is an arithmetic number, because the mean of its divisors is an integer number (57152580).

Almost surely, 2^220989947 is an apocalyptic number.

220989947 is a deficient number, since it is larger than the sum of its proper divisors (7620373).

220989947 is an equidigital number, since it uses as much as digits as its factorization.

220989947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620372.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 220989947 is about 14865.7306244934. The cubic root of 220989947 is about 604.5851920609.

The spelling of 220989947 in words is "two hundred twenty million, nine hundred eighty-nine thousand, nine hundred forty-seven".