20100009 has 8 divisors (see below), whose sum is σ = 26845920. Its totient is φ = 13377056.

The previous prime is 20099983. The next prime is 20100023. The reversal of 20100009 is 90000102.

It is a happy number.

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 20100009 - 2⁵ = 20099977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20099967 and 20100003.

It is not an unprimeable number, because it can be changed into a prime (20100079) 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, 3579 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (3355740).

Almost surely, 2^20100009 is an apocalyptic number.

It is an amenable number.

20100009 is a deficient number, since it is larger than the sum of its proper divisors (6745911).

20100009 is a wasteful number, since it uses less digits than its factorization.

20100009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11479.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 20100009 is about 4483.3033580163. The cubic root of 20100009 is about 271.8934532593.

The spelling of 20100009 in words is "twenty million, one hundred thousand, nine".