20768660540 has 12 divisors (see below), whose sum is σ = 43614187176. Its totient is φ = 8307464208.

The previous prime is 20768660537. The next prime is 20768660567. The reversal of 20768660540 is 4506686702.

It is a junction number, because it is equal to n+sod(n) for n = 20768660491 and 20768660500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519216494 + ... + 519216533.

It is an arithmetic number, because the mean of its divisors is an integer number (3634515598).

Almost surely, 2^20768660540 is an apocalyptic number.

20768660540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20768660540 is an abundant number, since it is smaller than the sum of its proper divisors (22845526636).

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

20768660540 is a wasteful number, since it uses less digits than its factorization.

20768660540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038433036 (or 1038433034 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20768660540 in words is "twenty billion, seven hundred sixty-eight million, six hundred sixty thousand, five hundred forty".