20644708607 has 8 divisors (see below), whose sum is σ = 20929699056. Its totient is φ = 20360581632.

The previous prime is 20644708603. The next prime is 20644708619. The reversal of 20644708607 is 70680744602.

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 20644708607 - 2² = 20644708603 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 (20644708603) 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, 167648 + ... + 263429.

It is an arithmetic number, because the mean of its divisors is an integer number (2616212382).

Almost surely, 2^20644708607 is an apocalyptic number.

20644708607 is a deficient number, since it is larger than the sum of its proper divisors (284990449).

20644708607 is an equidigital number, since it uses as much as digits as its factorization.

20644708607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431737.

The product of its (nonzero) digits is 451584, while the sum is 44.

The spelling of 20644708607 in words is "twenty billion, six hundred forty-four million, seven hundred eight thousand, six hundred seven".