20736905213 has 8 divisors (see below), whose sum is σ = 21453704280. Its totient is φ = 20020221760.

The previous prime is 20736905143. The next prime is 20736905219. The reversal of 20736905213 is 31250963702.

It can be written as a sum of positive squares in 4 ways, for example, as 12158811289 + 8578093924 = 110267^2 + 92618^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20736905213 - 2⁸ = 20736904957 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 (20736905219) 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 7 ways as a sum of consecutive naturals, for example, 500843 + ... + 540663.

It is an arithmetic number, because the mean of its divisors is an integer number (2681713035).

Almost surely, 2^20736905213 is an apocalyptic number.

It is an amenable number.

20736905213 is a deficient number, since it is larger than the sum of its proper divisors (716799067).

20736905213 is a wasteful number, since it uses less digits than its factorization.

20736905213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57807.

The product of its (nonzero) digits is 68040, while the sum is 38.

The spelling of 20736905213 in words is "twenty billion, seven hundred thirty-six million, nine hundred five thousand, two hundred thirteen".