20999484239 has 4 divisors (see below), whose sum is σ = 21446281824. Its totient is φ = 20552686656.

The previous prime is 20999484223. The next prime is 20999484241. The reversal of 20999484239 is 93248499902.

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 20999484239 - 2⁴ = 20999484223 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 (20999484439) 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, 223398722 + ... + 223398815.

It is an arithmetic number, because the mean of its divisors is an integer number (5361570456).

Almost surely, 2^20999484239 is an apocalyptic number.

20999484239 is a deficient number, since it is larger than the sum of its proper divisors (446797585).

20999484239 is an equidigital number, since it uses as much as digits as its factorization.

20999484239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446797584.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 20999484239 in words is "twenty billion, nine hundred ninety-nine million, four hundred eighty-four thousand, two hundred thirty-nine".