20545017 has 4 divisors (see below), whose sum is σ = 27393360. Its totient is φ = 13696676.

The previous prime is 20545001. The next prime is 20545037. The reversal of 20545017 is 71054502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20545017 - 2⁴ = 20545001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20545037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3424167 + ... + 3424172.

It is an arithmetic number, because the mean of its divisors is an integer number (6848340).

Almost surely, 2^20545017 is an apocalyptic number.

It is an amenable number.

20545017 is a deficient number, since it is larger than the sum of its proper divisors (6848343).

20545017 is an equidigital number, since it uses as much as digits as its factorization.

20545017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6848342.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20545017 is about 4532.6611388896. The cubic root of 20545017 is about 273.8853703823.

Adding to 20545017 its reverse (71054502), we get a palindrome (91599519).

The spelling of 20545017 in words is "twenty million, five hundred forty-five thousand, seventeen".