20530660656 has 80 divisors (see below), whose sum is σ = 59725605888. Its totient is φ = 6020716800.

The previous prime is 20530660639. The next prime is 20530660663. The reversal of 20530660656 is 65606603502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610791 + ... + 643526.

Almost surely, 2^20530660656 is an apocalyptic number.

It is an amenable number.

20530660656 is an abundant number, since it is smaller than the sum of its proper divisors (39194945232).

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

20530660656 is a wasteful number, since it uses less digits than its factorization.

20530660656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254370 (or 1254364 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

It can be divided in two parts, 20530 and 660656, that added together give a palindrome (681186).

The spelling of 20530660656 in words is "twenty billion, five hundred thirty million, six hundred sixty thousand, six hundred fifty-six".