20917027 has 4 divisors (see below), whose sum is σ = 21081856. Its totient is φ = 20752200.

The previous prime is 20917007. The next prime is 20917031. The reversal of 20917027 is 72071902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20917027 - 2¹⁹ = 20392739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20916986 and 20917004.

It is not an unprimeable number, because it can be changed into a prime (20917007) 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, 82224 + ... + 82477.

It is an arithmetic number, because the mean of its divisors is an integer number (5270464).

Almost surely, 2^20917027 is an apocalyptic number.

20917027 is a deficient number, since it is larger than the sum of its proper divisors (164829).

20917027 is a wasteful number, since it uses less digits than its factorization.

20917027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164828.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20917027 is about 4573.5136383310. The cubic root of 20917027 is about 275.5285789569.

Adding to 20917027 its reverse (72071902), we get a palindrome (92988929).

The spelling of 20917027 in words is "twenty million, nine hundred seventeen thousand, twenty-seven".