20565098 has 8 divisors (see below), whose sum is σ = 30917700. Its totient is φ = 10259200.

The previous prime is 20565091. The next prime is 20565101. The reversal of 20565098 is 89056502.

It can be written as a sum of positive squares in 2 ways, for example, as 17698849 + 2866249 = 4207^2 + 1693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20565091) 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, 10553 + ... + 12348.

Almost surely, 2^20565098 is an apocalyptic number.

20565098 is a deficient number, since it is larger than the sum of its proper divisors (10352602).

20565098 is a wasteful number, since it uses less digits than its factorization.

20565098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23352.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20565098 is about 4534.8757425094. The cubic root of 20565098 is about 273.9745745140.

The spelling of 20565098 in words is "twenty million, five hundred sixty-five thousand, ninety-eight".