17220947 has 8 divisors (see below), whose sum is σ = 17754816. Its totient is φ = 16690752.

The previous prime is 17220913. The next prime is 17220953. The reversal of 17220947 is 74902271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17220947 - 2⁸ = 17220691 is a prime.

It is a super-2 number, since 2×17220947² = 593122031153618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17220967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10838 + ... + 12324.

It is an arithmetic number, because the mean of its divisors is an integer number (2219352).

Almost surely, 2^17220947 is an apocalyptic number.

17220947 is a deficient number, since it is larger than the sum of its proper divisors (533869).

17220947 is a wasteful number, since it uses less digits than its factorization.

17220947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 17220947 is about 4149.8128873481. The cubic root of 17220947 is about 258.2373224438.

The spelling of 17220947 in words is "seventeen million, two hundred twenty thousand, nine hundred forty-seven".