20194653703549 has 4 divisors (see below), whose sum is σ = 21748088603836. Its totient is φ = 18641218803264.

The previous prime is 20194653703501. The next prime is 20194653703561. The reversal of 20194653703549 is 94530735649102.

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 3438361735524 + 16756291968025 = 1854282^2 + 4093445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20194653703549 - 2¹¹ = 20194653701501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20194653703493 and 20194653703502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20194653703579) 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, 776717450124 + ... + 776717450149.

It is an arithmetic number, because the mean of its divisors is an integer number (5437022150959).

Almost surely, 2^{20194653703549} is an apocalyptic number.

It is an amenable number.

20194653703549 is a deficient number, since it is larger than the sum of its proper divisors (1553434900287).

20194653703549 is a wasteful number, since it uses less digits than its factorization.

20194653703549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553434900286.

The product of its (nonzero) digits is 24494400, while the sum is 58.

The spelling of 20194653703549 in words is "twenty trillion, one hundred ninety-four billion, six hundred fifty-three million, seven hundred three thousand, five hundred forty-nine".