20102009999 has 4 divisors (see below), whose sum is σ = 20104372680. Its totient is φ = 20099647320.

The previous prime is 20102009981. The next prime is 20102010001. The reversal of 20102009999 is 99990020102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20102009999 - 2²⁸ = 19833574543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102009969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1168532 + ... + 1185609.

It is an arithmetic number, because the mean of its divisors is an integer number (5026093170).

Almost surely, 2^20102009999 is an apocalyptic number.

20102009999 is a deficient number, since it is larger than the sum of its proper divisors (2362681).

20102009999 is an equidigital number, since it uses as much as digits as its factorization.

20102009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362680.

The product of its (nonzero) digits is 26244, while the sum is 41.

The spelling of 20102009999 in words is "twenty billion, one hundred two million, nine thousand, nine hundred ninety-nine".