20988065239 has 4 divisors (see below), whose sum is σ = 21275573056. Its totient is φ = 20700557424.

The previous prime is 20988065237. The next prime is 20988065251. The reversal of 20988065239 is 93256088902.

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: 93256088902 = 2 ⋅46628044451.

It is a cyclic number.

It is not a de Polignac number, because 20988065239 - 2¹ = 20988065237 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 (20988065233) 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, 143753799 + ... + 143753944.

It is an arithmetic number, because the mean of its divisors is an integer number (5318893264).

Almost surely, 2^20988065239 is an apocalyptic number.

20988065239 is a deficient number, since it is larger than the sum of its proper divisors (287507817).

20988065239 is an equidigital number, since it uses as much as digits as its factorization.

20988065239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287507816.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 20988065239 in words is "twenty billion, nine hundred eighty-eight million, sixty-five thousand, two hundred thirty-nine".