20110019999 has 4 divisors (see below), whose sum is σ = 20439692520. Its totient is φ = 19780347480.

The previous prime is 20110019981. The next prime is 20110020037. The reversal of 20110019999 is 99991001102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99991001102 = 2 ⋅49995500551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110019999 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 (20110019959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164836169 + ... + 164836290.

It is an arithmetic number, because the mean of its divisors is an integer number (5109923130).

Almost surely, 2^20110019999 is an apocalyptic number.

20110019999 is a deficient number, since it is larger than the sum of its proper divisors (329672521).

20110019999 is an equidigital number, since it uses as much as digits as its factorization.

20110019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329672520.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 20110019999 in words is "twenty billion, one hundred ten million, nineteen thousand, nine hundred ninety-nine".