20785279493317 has 4 divisors (see below), whose sum is σ = 20890788526476. Its totient is φ = 20679770460160.

The previous prime is 20785279493263. The next prime is 20785279493323. The reversal of 20785279493317 is 71339497258702.

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 10519701941281 + 10265577552036 = 3243409^2 + 3203994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20785279493317 - 2⁷ = 20785279493189 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 (20785279493417) 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, 52754516284 + ... + 52754516677.

It is an arithmetic number, because the mean of its divisors is an integer number (5222697131619).

Almost surely, 2^{20785279493317} is an apocalyptic number.

It is an amenable number.

20785279493317 is a deficient number, since it is larger than the sum of its proper divisors (105509033159).

20785279493317 is a wasteful number, since it uses less digits than its factorization.

20785279493317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105509033158.

The product of its (nonzero) digits is 160030080, while the sum is 67.

The spelling of 20785279493317 in words is "twenty trillion, seven hundred eighty-five billion, two hundred seventy-nine million, four hundred ninety-three thousand, three hundred seventeen".