20688455028232 has 16 divisors (see below), whose sum is σ = 38791666421100. Its totient is φ = 10344010649280.

The previous prime is 20688455028181. The next prime is 20688455028233. The reversal of 20688455028232 is 23282055488602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20532371562756 + 156083465476 = 4531266^2 + 395074^2 .

It is not an unprimeable number, because it can be changed into a prime (20688455028233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26702307 + ... + 27466162.

Almost surely, 2^{20688455028232} is an apocalyptic number.

It is an amenable number.

20688455028232 is a deficient number, since it is larger than the sum of its proper divisors (18103211392868).

20688455028232 is a wasteful number, since it uses less digits than its factorization.

20688455028232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54216216 (or 54216212 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 55.

The spelling of 20688455028232 in words is "twenty trillion, six hundred eighty-eight billion, four hundred fifty-five million, twenty-eight thousand, two hundred thirty-two".