20045017 has 2 divisors, whose sum is σ = 20045018. Its totient is φ = 20045016.

The previous prime is 20044987. The next prime is 20045063. The reversal of 20045017 is 71054002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 6911641 = 3624^2 + 2629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20045017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20044985 and 20045003.

It is not a weakly prime, because it can be changed into another prime (20045087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022508 + 10022509.

It is an arithmetic number, because the mean of its divisors is an integer number (10022509).

Almost surely, 2^20045017 is an apocalyptic number.

It is an amenable number.

20045017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045017 is an equidigital number, since it uses as much as digits as its factorization.

20045017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20045017 is about 4477.1661796275. The cubic root of 20045017 is about 271.6452672786.

Adding to 20045017 its reverse (71054002), we get a palindrome (91099019).

It can be divided in two parts, 2004 and 5017, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 20045017 in words is "twenty million, forty-five thousand, seventeen".