20688668484 has 48 divisors (see below), whose sum is σ = 52670640960. Its totient is φ = 6268272640.

The previous prime is 20688668479. The next prime is 20688668489. The reversal of 20688668484 is 48486688602.

It is an interprime number because it is at equal distance from previous prime (20688668479) and next prime (20688668489).

It is not an unprimeable number, because it can be changed into a prime (20688668489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1350532 + ... + 1365764.

It is an arithmetic number, because the mean of its divisors is an integer number (1097305020).

Almost surely, 2^20688668484 is an apocalyptic number.

It is an amenable number.

20688668484 is an abundant number, since it is smaller than the sum of its proper divisors (31981972476).

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

20688668484 is a wasteful number, since it uses less digits than its factorization.

20688668484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25540 (or 25538 counting only the distinct ones).

The product of its (nonzero) digits is 28311552, while the sum is 60.

The spelling of 20688668484 in words is "twenty billion, six hundred eighty-eight million, six hundred sixty-eight thousand, four hundred eighty-four".