20756743815 has 32 divisors (see below), whose sum is σ = 33563793600. Its totient is φ = 10952755200.

The previous prime is 20756743807. The next prime is 20756743817. The reversal of 20756743815 is 51834765702.

It is not a de Polignac number, because 20756743815 - 2³ = 20756743807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20756743817) 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 31 ways as a sum of consecutive naturals, for example, 2524431 + ... + 2532639.

It is an arithmetic number, because the mean of its divisors is an integer number (1048868550).

Almost surely, 2^20756743815 is an apocalyptic number.

20756743815 is a deficient number, since it is larger than the sum of its proper divisors (12807049785).

20756743815 is a wasteful number, since it uses less digits than its factorization.

20756743815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9987.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 20756743815 in words is "twenty billion, seven hundred fifty-six million, seven hundred forty-three thousand, eight hundred fifteen".