20243111999 has 8 divisors (see below), whose sum is σ = 22622014800. Its totient is φ = 17953979200.

The previous prime is 20243111971. The next prime is 20243112011. The reversal of 20243111999 is 99911134202.

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

It is a cyclic number.

It is not a de Polignac number, because 20243111999 - 2¹² = 20243107903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243111299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22442024 + ... + 22442925.

It is an arithmetic number, because the mean of its divisors is an integer number (2827751850).

Almost surely, 2^20243111999 is an apocalyptic number.

20243111999 is a deficient number, since it is larger than the sum of its proper divisors (2378902801).

20243111999 is a wasteful number, since it uses less digits than its factorization.

20243111999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44885001.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 20243111999 in words is "twenty billion, two hundred forty-three million, one hundred eleven thousand, nine hundred ninety-nine".