20971756760 has 32 divisors (see below), whose sum is σ = 47365892640. Its totient is φ = 8356802304.

The previous prime is 20971756759. The next prime is 20971756781. The reversal of 20971756760 is 6765717902.

It is a junction number, because it is equal to n+sod(n) for n = 20971756699 and 20971756708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986237 + ... + 1007276.

It is an arithmetic number, because the mean of its divisors is an integer number (1480184145).

Almost surely, 2^20971756760 is an apocalyptic number.

20971756760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20971756760 is an abundant number, since it is smaller than the sum of its proper divisors (26394135880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20971756760 is a wasteful number, since it uses less digits than its factorization.

20971756760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993787 (or 1993783 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 50.

The spelling of 20971756760 in words is "twenty billion, nine hundred seventy-one million, seven hundred fifty-six thousand, seven hundred sixty".