20005617 has 8 divisors (see below), whose sum is σ = 28243296. Its totient is φ = 12552512.

The previous prime is 20005603. The next prime is 20005637. The reversal of 20005617 is 71650002.

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 20005617 - 2⁸ = 20005361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20005593 and 20005602.

It is not an unprimeable number, because it can be changed into a prime (20005637) 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, 196083 + ... + 196184.

It is an arithmetic number, because the mean of its divisors is an integer number (3530412).

Almost surely, 2^20005617 is an apocalyptic number.

It is an amenable number.

20005617 is a deficient number, since it is larger than the sum of its proper divisors (8237679).

20005617 is a wasteful number, since it uses less digits than its factorization.

20005617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392287.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20005617 is about 4472.7639106038. The cubic root of 20005617 is about 271.4671707538.

Adding to 20005617 its reverse (71650002), we get a palindrome (91655619).

The spelling of 20005617 in words is "twenty million, five thousand, six hundred seventeen".