20617345 has 16 divisors (see below), whose sum is σ = 29939328. Its totient is φ = 13305600.

The previous prime is 20617343. The next prime is 20617357. The reversal of 20617345 is 54371602.

It is not a de Polignac number, because 20617345 - 2¹ = 20617343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16731 + ... + 17920.

It is an arithmetic number, because the mean of its divisors is an integer number (1871208).

Almost surely, 2^20617345 is an apocalyptic number.

It is an amenable number.

20617345 is a deficient number, since it is larger than the sum of its proper divisors (9321983).

20617345 is a wasteful number, since it uses less digits than its factorization.

20617345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34680.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20617345 is about 4540.6326651690. The cubic root of 20617345 is about 274.2063951856.

Adding to 20617345 its reverse (54371602), we get a palindrome (74988947).

The spelling of 20617345 in words is "twenty million, six hundred seventeen thousand, three hundred forty-five".