20211017 has 8 divisors (see below), whose sum is σ = 20580000. Its totient is φ = 19845504.

The previous prime is 20211007. The next prime is 20211031. The reversal of 20211017 is 71011202.

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 20211017 - 2⁴ = 20211001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210992 and 20211010.

It is not an unprimeable number, because it can be changed into a prime (20211007) 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, 12734 + ... + 14232.

It is an arithmetic number, because the mean of its divisors is an integer number (2572500).

Almost surely, 2^20211017 is an apocalyptic number.

It is an amenable number.

20211017 is a deficient number, since it is larger than the sum of its proper divisors (368983).

20211017 is a wasteful number, since it uses less digits than its factorization.

20211017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20211017 is about 4495.6664689454. Note that the first 3 decimals coincide. The cubic root of 20211017 is about 272.3930708596.

Adding to 20211017 its reverse (71011202), we get a palindrome (91222219).

The spelling of 20211017 in words is "twenty million, two hundred eleven thousand, seventeen".