20372367665017 has 4 divisors (see below), whose sum is σ = 20444867194356. Its totient is φ = 20299868135680.

The previous prime is 20372367665009. The next prime is 20372367665053. The reversal of 20372367665017 is 71056676327302.

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 5169457038736 + 15202910626281 = 2273644^2 + 3899091^2 .

It is a cyclic number.

It is not a de Polignac number, because 20372367665017 - 2³ = 20372367665009 is a prime.

It is a super-2 number, since 2×20372367665017² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20372367665057) 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, 36249764248 + ... + 36249764809.

It is an arithmetic number, because the mean of its divisors is an integer number (5111216798589).

Almost surely, 2^{20372367665017} is an apocalyptic number.

It is an amenable number.

20372367665017 is a deficient number, since it is larger than the sum of its proper divisors (72499529339).

20372367665017 is an equidigital number, since it uses as much as digits as its factorization.

20372367665017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72499529338.

The product of its (nonzero) digits is 13335840, while the sum is 55.

The spelling of 20372367665017 in words is "twenty trillion, three hundred seventy-two billion, three hundred sixty-seven million, six hundred sixty-five thousand, seventeen".