20617145465 has 24 divisors (see below), whose sum is σ = 28450755648. Its totient is φ = 14050104480.

The previous prime is 20617145459. The next prime is 20617145489. The reversal of 20617145465 is 56454171602.

It is not a de Polignac number, because 20617145465 - 2¹⁰ = 20617144441 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 918830 + ... + 941000.

It is an arithmetic number, because the mean of its divisors is an integer number (1185448152).

Almost surely, 2^20617145465 is an apocalyptic number.

It is an amenable number.

20617145465 is a deficient number, since it is larger than the sum of its proper divisors (7833610183).

20617145465 is an equidigital number, since it uses as much as digits as its factorization.

20617145465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22509 (or 22346 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 20617145465 in words is "twenty billion, six hundred seventeen million, one hundred forty-five thousand, four hundred sixty-five".