20617207155579 has 8 divisors (see below), whose sum is σ = 27500513798992. Its totient is φ = 13739352641280.

The previous prime is 20617207155511. The next prime is 20617207155583. The reversal of 20617207155579 is 97555170271602.

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

It is not a de Polignac number, because 20617207155579 - 2¹² = 20617207151483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617207157579) 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, 1363023454 + ... + 1363038579.

It is an arithmetic number, because the mean of its divisors is an integer number (3437564224874).

Almost surely, 2^{20617207155579} is an apocalyptic number.

20617207155579 is a deficient number, since it is larger than the sum of its proper divisors (6883306643413).

20617207155579 is a wasteful number, since it uses less digits than its factorization.

20617207155579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726064557.

The product of its (nonzero) digits is 9261000, while the sum is 57.

The spelling of 20617207155579 in words is "twenty trillion, six hundred seventeen billion, two hundred seven million, one hundred fifty-five thousand, five hundred seventy-nine".