17420845 has 8 divisors (see below), whose sum is σ = 22513176. Its totient is φ = 12864576.

The previous prime is 17420833. The next prime is 17420849. The reversal of 17420845 is 54802471.

It can be written as a sum of positive squares in 4 ways, for example, as 749956 + 16670889 = 866^2 + 4083^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17420845 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17420849) 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, 133942 + ... + 134071.

It is an arithmetic number, because the mean of its divisors is an integer number (2814147).

Almost surely, 2^17420845 is an apocalyptic number.

It is an amenable number.

17420845 is a deficient number, since it is larger than the sum of its proper divisors (5092331).

17420845 is a wasteful number, since it uses less digits than its factorization.

17420845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268031.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 17420845 is about 4173.8285781762. The cubic root of 17420845 is about 259.2326735487.

The spelling of 17420845 in words is "seventeen million, four hundred twenty thousand, eight hundred forty-five".