20916017 has 8 divisors (see below), whose sum is σ = 22529760. Its totient is φ = 19353600.

The previous prime is 20915981. The next prime is 20916019. The reversal of 20916017 is 71061902.

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 20916017 - 2⁶ = 20915953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20916019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11984 + ... + 13617.

It is an arithmetic number, because the mean of its divisors is an integer number (2816220).

Almost surely, 2^20916017 is an apocalyptic number.

It is an amenable number.

20916017 is a deficient number, since it is larger than the sum of its proper divisors (1613743).

20916017 is a wasteful number, since it uses less digits than its factorization.

20916017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25663.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20916017 is about 4573.4032186108. The cubic root of 20916017 is about 275.5241441593.

Adding to 20916017 its reverse (71061902), we get a palindrome (91977919).

The spelling of 20916017 in words is "twenty million, nine hundred sixteen thousand, seventeen".