20756744845 has 16 divisors (see below), whose sum is σ = 26228384640. Its totient is φ = 15725824704.

The previous prime is 20756744837. The next prime is 20756744851. The reversal of 20756744845 is 54844765702.

It is a cyclic number.

It is not a de Polignac number, because 20756744845 - 2³ = 20756744837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20756744792 and 20756744801.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 239664 + ... + 314566.

It is an arithmetic number, because the mean of its divisors is an integer number (1639274040).

Almost surely, 2^20756744845 is an apocalyptic number.

It is an amenable number.

20756744845 is a deficient number, since it is larger than the sum of its proper divisors (5471639795).

20756744845 is a wasteful number, since it uses less digits than its factorization.

20756744845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77844.

The product of its (nonzero) digits is 7526400, while the sum is 52.

The spelling of 20756744845 in words is "twenty billion, seven hundred fifty-six million, seven hundred forty-four thousand, eight hundred forty-five".