20550009 has 8 divisors (see below), whose sum is σ = 28344960. Its totient is φ = 13227536.

The previous prime is 20550007. The next prime is 20550037. The reversal of 20550009 is 90005502.

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

It is a cyclic number.

It is not a de Polignac number, because 20550009 - 2¹ = 20550007 is a prime.

It is a super-3 number, since 3×20550009³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20550007) 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 7 ways as a sum of consecutive naturals, for example, 118017 + ... + 118190.

It is an arithmetic number, because the mean of its divisors is an integer number (3543120).

Almost surely, 2^20550009 is an apocalyptic number.

20550009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20550009 is a deficient number, since it is larger than the sum of its proper divisors (7794951).

20550009 is a wasteful number, since it uses less digits than its factorization.

20550009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236239.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 20550009 is about 4533.2117753310. The cubic root of 20550009 is about 273.9075513496.

The spelling of 20550009 in words is "twenty million, five hundred fifty thousand, nine".