20708840959 has 4 divisors (see below), whose sum is σ = 20828545416. Its totient is φ = 20589136504.

The previous prime is 20708840917. The next prime is 20708840987. The reversal of 20708840959 is 95904880702.

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 20708840959 - 2⁹ = 20708840447 is a prime.

It is a super-3 number, since 3×20708840959³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708850959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59851969 + ... + 59852314.

It is an arithmetic number, because the mean of its divisors is an integer number (5207136354).

Almost surely, 2^20708840959 is an apocalyptic number.

20708840959 is a deficient number, since it is larger than the sum of its proper divisors (119704457).

20708840959 is a wasteful number, since it uses less digits than its factorization.

20708840959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119704456.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 20708840959 in words is "twenty billion, seven hundred eight million, eight hundred forty thousand, nine hundred fifty-nine".