20740756513 has 4 divisors (see below), whose sum is σ = 20741613760. Its totient is φ = 20739899268.

The previous prime is 20740756499. The next prime is 20740756523. The reversal of 20740756513 is 31565704702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20740756513 - 2¹³ = 20740748321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20740756523) 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, 391245 + ... + 441082.

It is an arithmetic number, because the mean of its divisors is an integer number (5185403440).

Almost surely, 2^20740756513 is an apocalyptic number.

It is an amenable number.

20740756513 is a deficient number, since it is larger than the sum of its proper divisors (857247).

20740756513 is an equidigital number, since it uses as much as digits as its factorization.

20740756513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857246.

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 20740756513 in words is "twenty billion, seven hundred forty million, seven hundred fifty-six thousand, five hundred thirteen".