20630017 has 4 divisors (see below), whose sum is σ = 20968276. Its totient is φ = 20291760.

The previous prime is 20630003. The next prime is 20630021. The reversal of 20630017 is 71003602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71003602 = 2 ⋅35501801.

It can be written as a sum of positive squares in 2 ways, for example, as 5645376 + 14984641 = 2376^2 + 3871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20630017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20629976 and 20630003.

It is not an unprimeable number, because it can be changed into a prime (20630087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169038 + ... + 169159.

It is an arithmetic number, because the mean of its divisors is an integer number (5242069).

Almost surely, 2^20630017 is an apocalyptic number.

It is an amenable number.

20630017 is a deficient number, since it is larger than the sum of its proper divisors (338259).

20630017 is an equidigital number, since it uses as much as digits as its factorization.

20630017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338258.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20630017 is about 4542.0278510815. The cubic root of 20630017 is about 274.2625620003.

Adding to 20630017 its reverse (71003602), we get a palindrome (91633619).

The spelling of 20630017 in words is "twenty million, six hundred thirty thousand, seventeen".