20927017 has 4 divisors (see below), whose sum is σ = 22158036. Its totient is φ = 19696000.

The previous prime is 20927003. The next prime is 20927041. The reversal of 20927017 is 71072902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71072902 = 2 ⋅35536451.

It can be written as a sum of positive squares in 2 ways, for example, as 7502121 + 13424896 = 2739^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 20927017 - 2⁷ = 20926889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20927057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615484 + ... + 615517.

It is an arithmetic number, because the mean of its divisors is an integer number (5539509).

Almost surely, 2^20927017 is an apocalyptic number.

It is an amenable number.

20927017 is a deficient number, since it is larger than the sum of its proper divisors (1231019).

20927017 is a wasteful number, since it uses less digits than its factorization.

20927017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231018.

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

The square root of 20927017 is about 4574.6056660657. The cubic root of 20927017 is about 275.5724362479.

Adding to 20927017 its reverse (71072902), we get a palindrome (91999919).

The spelling of 20927017 in words is "twenty million, nine hundred twenty-seven thousand, seventeen".