20109999999 has 8 divisors (see below), whose sum is σ = 26813988352. Its totient is φ = 13406339160.

The previous prime is 20109999989. The next prime is 20110000003. The reversal of 20109999999 is 99999990102.

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

It is not a de Polignac number, because 20109999999 - 2⁹ = 20109999487 is a prime.

It is a Duffinian number.

20109999999 is a modest number, since divided by 999999 gives 20109 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202194 + ... + 284784.

It is an arithmetic number, because the mean of its divisors is an integer number (3351748544).

Almost surely, 2^20109999999 is an apocalyptic number.

20109999999 is a deficient number, since it is larger than the sum of its proper divisors (6703988353).

20109999999 is an equidigital number, since it uses as much as digits as its factorization.

20109999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163757.

The product of its (nonzero) digits is 9565938, while the sum is 66.

The spelling of 20109999999 in words is "twenty billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".