20783270652517 has 8 divisors (see below), whose sum is σ = 22006151720856. Its totient is φ = 19560426888192.

The previous prime is 20783270652503. The next prime is 20783270652523. The reversal of 20783270652517 is 71525607238702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10537548253281 + 10245722399236 = 3246159^2 + 3200894^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20783270652517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20783270652217) 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, 8174898 + ... + 10411315.

It is an arithmetic number, because the mean of its divisors is an integer number (2750768965107).

Almost surely, 2^{20783270652517} is an apocalyptic number.

It is an amenable number.

20783270652517 is a deficient number, since it is larger than the sum of its proper divisors (1222881068339).

20783270652517 is a wasteful number, since it uses less digits than its factorization.

20783270652517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18652007.

The product of its (nonzero) digits is 9878400, while the sum is 55.

The spelling of 20783270652517 in words is "twenty trillion, seven hundred eighty-three billion, two hundred seventy million, six hundred fifty-two thousand, five hundred seventeen".