20609148917 has 8 divisors (see below), whose sum is σ = 23837088576. Its totient is φ = 17452153152.

The previous prime is 20609148869. The next prime is 20609148953. The reversal of 20609148917 is 71984190602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20609148917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609148997) 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, 17735348 + ... + 17736509.

It is an arithmetic number, because the mean of its divisors is an integer number (2979636072).

Almost surely, 2^20609148917 is an apocalyptic number.

It is an amenable number.

20609148917 is a deficient number, since it is larger than the sum of its proper divisors (3227939659).

20609148917 is an equidigital number, since it uses as much as digits as its factorization.

20609148917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35471947.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 20609148917 in words is "twenty billion, six hundred nine million, one hundred forty-eight thousand, nine hundred seventeen".