20640692589 has 8 divisors (see below), whose sum is σ = 30022825632. Its totient is φ = 12509510640.

The previous prime is 20640692581. The next prime is 20640692599. The reversal of 20640692589 is 98529604602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20640692589 - 2³ = 20640692581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640692581) 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, 312737734 + ... + 312737799.

It is an arithmetic number, because the mean of its divisors is an integer number (3752853204).

Almost surely, 2^20640692589 is an apocalyptic number.

It is an amenable number.

20640692589 is a deficient number, since it is larger than the sum of its proper divisors (9382133043).

20640692589 is a wasteful number, since it uses less digits than its factorization.

20640692589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625475547.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 20640692589 in words is "twenty billion, six hundred forty million, six hundred ninety-two thousand, five hundred eighty-nine".