20765136213 has 16 divisors (see below), whose sum is σ = 30840669760. Its totient is φ = 13808546928.

The previous prime is 20765136179. The next prime is 20765136221. The reversal of 20765136213 is 31263156702.

20765136213 is a `hidden beast` number, since 2 + 0 + 76 + 513 + 62 + 13 = 666.

It is not a de Polignac number, because 20765136213 - 2⁸ = 20765135957 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 (20765134213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957895 + ... + 979332.

It is an arithmetic number, because the mean of its divisors is an integer number (1927541860).

Almost surely, 2^20765136213 is an apocalyptic number.

It is an amenable number.

20765136213 is a deficient number, since it is larger than the sum of its proper divisors (10075533547).

20765136213 is a wasteful number, since it uses less digits than its factorization.

20765136213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937633 (or 1937627 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 20765136213 in words is "twenty billion, seven hundred sixty-five million, one hundred thirty-six thousand, two hundred thirteen".