20494672689 has 8 divisors (see below), whose sum is σ = 27334417792. Its totient is φ = 13659021360.

The previous prime is 20494672613. The next prime is 20494672691. The reversal of 20494672689 is 98627649402.

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

It is not a de Polignac number, because 20494672689 - 2¹⁹ = 20494148401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20494672189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1011742 + ... + 1031799.

It is an arithmetic number, because the mean of its divisors is an integer number (3416802224).

Almost surely, 2^20494672689 is an apocalyptic number.

It is an amenable number.

20494672689 is a deficient number, since it is larger than the sum of its proper divisors (6839745103).

20494672689 is a wasteful number, since it uses less digits than its factorization.

20494672689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046887.

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 20494672689 in words is "twenty billion, four hundred ninety-four million, six hundred seventy-two thousand, six hundred eighty-nine".