17220985 has 4 divisors (see below), whose sum is σ = 20665188. Its totient is φ = 13776784.

The previous prime is 17220967. The next prime is 17220991. The reversal of 17220985 is 58902271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58902271 = 61 ⋅965611.

It can be written as a sum of positive squares in 2 ways, for example, as 12257001 + 4963984 = 3501^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 17220985 - 2⁵ = 17220953 is a prime.

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 17220985.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1722094 + ... + 1722103.

It is an arithmetic number, because the mean of its divisors is an integer number (5166297).

Almost surely, 2^17220985 is an apocalyptic number.

It is an amenable number.

17220985 is a deficient number, since it is larger than the sum of its proper divisors (3444203).

17220985 is an equidigital number, since it uses as much as digits as its factorization.

17220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444202.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 17220985 is about 4149.8174658652. The cubic root of 17220985 is about 258.2375123871.

The spelling of 17220985 in words is "seventeen million, two hundred twenty thousand, nine hundred eighty-five".