20550017465 has 4 divisors (see below), whose sum is σ = 24660020964. Its totient is φ = 16440013968.

The previous prime is 20550017461. The next prime is 20550017471. The reversal of 20550017465 is 56471005502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8879104441 + 11670913024 = 94229^2 + 108032^2 .

It is a cyclic number.

It is not a de Polignac number, because 20550017465 - 2² = 20550017461 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 (20550017461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055001742 + ... + 2055001751.

It is an arithmetic number, because the mean of its divisors is an integer number (6165005241).

Almost surely, 2^20550017465 is an apocalyptic number.

It is an amenable number.

20550017465 is a deficient number, since it is larger than the sum of its proper divisors (4110003499).

20550017465 is an equidigital number, since it uses as much as digits as its factorization.

20550017465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110003498.

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 20550017465 in words is "twenty billion, five hundred fifty million, seventeen thousand, four hundred sixty-five".