20706609959 has 16 divisors (see below), whose sum is σ = 24330398016. Its totient is φ = 17250278400.

The previous prime is 20706609949. The next prime is 20706609961. The reversal of 20706609959 is 95990660702.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20706609959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20706609959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706609949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201239 + ... + 286199.

It is an arithmetic number, because the mean of its divisors is an integer number (1520649876).

Almost surely, 2^20706609959 is an apocalyptic number.

20706609959 is a deficient number, since it is larger than the sum of its proper divisors (3623788057).

20706609959 is an equidigital number, since it uses as much as digits as its factorization.

20706609959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85946.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 20706609959 in words is "twenty billion, seven hundred six million, six hundred nine thousand, nine hundred fifty-nine".