20012999999 has 4 divisors (see below), whose sum is σ = 20015222136. Its totient is φ = 20010777864.

The previous prime is 20012999989. The next prime is 20013000043. The reversal of 20012999999 is 99999921002.

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 20012999999 - 2²⁰ = 20011951423 is a prime.

It is a Duffinian number.

20012999999 is a modest number, since divided by 999999 gives 20012 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097504 + ... + 1115589.

It is an arithmetic number, because the mean of its divisors is an integer number (5003805534).

Almost surely, 2^20012999999 is an apocalyptic number.

20012999999 is a deficient number, since it is larger than the sum of its proper divisors (2222137).

20012999999 is an equidigital number, since it uses as much as digits as its factorization.

20012999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222136.

The product of its (nonzero) digits is 2125764, while the sum is 59.

The spelling of 20012999999 in words is "twenty billion, twelve million, nine hundred ninety-nine thousand, nine hundred ninety-nine".