17420705 has 4 divisors (see below), whose sum is σ = 20904852. Its totient is φ = 13936560.

The previous prime is 17420687. The next prime is 17420713. The reversal of 17420705 is 50702471.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50702471 = 103 ⋅492257.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 6974881 = 3232^2 + 2641^2 .

It is not a de Polignac number, because 17420705 - 2²² = 13226401 is a prime.

It is a Duffinian number.

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, 1742066 + ... + 1742075.

It is an arithmetic number, because the mean of its divisors is an integer number (5226213).

Almost surely, 2^17420705 is an apocalyptic number.

It is an amenable number.

17420705 is a deficient number, since it is larger than the sum of its proper divisors (3484147).

17420705 is an equidigital number, since it uses as much as digits as its factorization.

17420705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484146.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 17420705 is about 4173.8118069697. The cubic root of 17420705 is about 259.2319791188.

The spelling of 17420705 in words is "seventeen million, four hundred twenty thousand, seven hundred five".