20761606815717 has 8 divisors (see below), whose sum is σ = 27682189831296. Its totient is φ = 13841047505312.

The previous prime is 20761606815707. The next prime is 20761606815749. The reversal of 20761606815717 is 71751860616702.

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

It is a cyclic number.

It is not a de Polignac number, because 20761606815717 - 2⁸ = 20761606815461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761606815707) 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, 3770688 + ... + 7466009.

It is an arithmetic number, because the mean of its divisors is an integer number (3460273728912).

Almost surely, 2^{20761606815717} is an apocalyptic number.

It is an amenable number.

20761606815717 is a deficient number, since it is larger than the sum of its proper divisors (6920583015579).

20761606815717 is a wasteful number, since it uses less digits than its factorization.

20761606815717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11852587.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 20761606815717 in words is "twenty trillion, seven hundred sixty-one billion, six hundred six million, eight hundred fifteen thousand, seven hundred seventeen".