20348594787809 has 4 divisors (see below), whose sum is σ = 20368293331716. Its totient is φ = 20328896243904.

The previous prime is 20348594787803. The next prime is 20348594787811. The reversal of 20348594787809 is 90878749584302.

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 15400350251584 + 4948244536225 = 3924328^2 + 2224465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20348594787809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20348594787803) 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, 9849270404 + ... + 9849272469.

It is an arithmetic number, because the mean of its divisors is an integer number (5092073332929).

Almost surely, 2^{20348594787809} is an apocalyptic number.

It is an amenable number.

20348594787809 is a deficient number, since it is larger than the sum of its proper divisors (19698543907).

20348594787809 is a wasteful number, since it uses less digits than its factorization.

20348594787809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19698543906.

The product of its (nonzero) digits is 975421440, while the sum is 74.

The spelling of 20348594787809 in words is "twenty trillion, three hundred forty-eight billion, five hundred ninety-four million, seven hundred eighty-seven thousand, eight hundred nine".