20688788844 has 18 divisors (see below), whose sum is σ = 52296660780. Its totient is φ = 6896262936.

The previous prime is 20688788839. The next prime is 20688788849. The reversal of 20688788844 is 44888788602.

It is an interprime number because it is at equal distance from previous prime (20688788839) and next prime (20688788849).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20688788849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 287344254 + ... + 287344325.

Almost surely, 2^20688788844 is an apocalyptic number.

It is an amenable number.

20688788844 is an abundant number, since it is smaller than the sum of its proper divisors (31607871936).

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

20688788844 is a wasteful number, since it uses less digits than its factorization.

20688788844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574688589 (or 574688584 counting only the distinct ones).

The product of its (nonzero) digits is 44040192, while the sum is 63.

The spelling of 20688788844 in words is "twenty billion, six hundred eighty-eight million, seven hundred eighty-eight thousand, eight hundred forty-four".