20019929999 has 4 divisors (see below), whose sum is σ = 20024818200. Its totient is φ = 20015041800.

The previous prime is 20019929989. The next prime is 20019930017. The reversal of 20019929999 is 99992991002.

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 20019929999 - 2²⁰ = 20018881423 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 (20019929959) 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, 2437952 + ... + 2446149.

It is an arithmetic number, because the mean of its divisors is an integer number (5006204550).

Almost surely, 2^20019929999 is an apocalyptic number.

20019929999 is a deficient number, since it is larger than the sum of its proper divisors (4888201).

20019929999 is an equidigital number, since it uses as much as digits as its factorization.

20019929999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4888200.

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

The spelling of 20019929999 in words is "twenty billion, nineteen million, nine hundred twenty-nine thousand, nine hundred ninety-nine".