20746894349 has 4 divisors (see below), whose sum is σ = 20759416764. Its totient is φ = 20734371936.

The previous prime is 20746894331. The next prime is 20746894369. The reversal of 20746894349 is 94349864702.

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 12762220900 + 7984673449 = 112970^2 + 89357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20746894349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20746894294 and 20746894303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20746894319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6258722 + ... + 6262035.

It is an arithmetic number, because the mean of its divisors is an integer number (5189854191).

Almost surely, 2^20746894349 is an apocalyptic number.

It is an amenable number.

20746894349 is a deficient number, since it is larger than the sum of its proper divisors (12522415).

20746894349 is a wasteful number, since it uses less digits than its factorization.

20746894349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12522414.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 20746894349 in words is "twenty billion, seven hundred forty-six million, eight hundred ninety-four thousand, three hundred forty-nine".