17220416 has 14 divisors (see below), whose sum is σ = 34171890. Its totient is φ = 8610176.

The previous prime is 17220383. The next prime is 17220419. The reversal of 17220416 is 61402271.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 246016 = 4120^2 + 496^2 .

It is a junction number, because it is equal to n+sod(n) for n = 17220391 and 17220400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17220419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134471 + ... + 134598.

Almost surely, 2^17220416 is an apocalyptic number.

17220416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

17220416 is a deficient number, since it is larger than the sum of its proper divisors (16951474).

17220416 is an equidigital number, since it uses as much as digits as its factorization.

17220416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269081 (or 269071 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 17220416 is about 4149.7489080666. The cubic root of 17220416 is about 258.2346682067.

Adding to 17220416 its reverse (61402271), we get a palindrome (78622687).

The spelling of 17220416 in words is "seventeen million, two hundred twenty thousand, four hundred sixteen".