20918027 has 4 divisors (see below), whose sum is σ = 22527120. Its totient is φ = 19308936.

The previous prime is 20918011. The next prime is 20918033. The reversal of 20918027 is 72081902.

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: 72081902 = 2 ⋅36040951.

It is a cyclic number.

It is not a de Polignac number, because 20918027 - 2⁴ = 20918011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20918047) 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, 804527 + ... + 804552.

It is an arithmetic number, because the mean of its divisors is an integer number (5631780).

Almost surely, 2^20918027 is an apocalyptic number.

20918027 is a deficient number, since it is larger than the sum of its proper divisors (1609093).

20918027 is a wasteful number, since it uses less digits than its factorization.

20918027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609092.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20918027 is about 4573.6229621603. The cubic root of 20918027 is about 275.5329697050.

Adding to 20918027 its reverse (72081902), we get a palindrome (92999929).

The spelling of 20918027 in words is "twenty million, nine hundred eighteen thousand, twenty-seven".