20427165 has 48 divisors (see below), whose sum is σ = 39985920. Its totient is φ = 9555840.

The previous prime is 20427139. The next prime is 20427179. The reversal of 20427165 is 56172402.

It is not a de Polignac number, because 20427165 - 2⁷ = 20427037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13644 + ... + 15066.

It is an arithmetic number, because the mean of its divisors is an integer number (833040).

Almost surely, 2^20427165 is an apocalyptic number.

It is an amenable number.

20427165 is a deficient number, since it is larger than the sum of its proper divisors (19558755).

20427165 is a wasteful number, since it uses less digits than its factorization.

20427165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20427165 is about 4519.6421318507. The cubic root of 20427165 is about 273.3606713023.

Adding to 20427165 its reverse (56172402), we get a palindrome (76599567).

The spelling of 20427165 in words is "twenty million, four hundred twenty-seven thousand, one hundred sixty-five".