20788437915 has 96 divisors (see below), whose sum is σ = 43113231360. Its totient is φ = 9476284608.

The previous prime is 20788437907. The next prime is 20788437919. The reversal of 20788437915 is 51973488702.

It is a happy number.

It is not a de Polignac number, because 20788437915 - 2³ = 20788437907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20788437919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2423424 + ... + 2431986.

It is an arithmetic number, because the mean of its divisors is an integer number (449096160).

Almost surely, 2^20788437915 is an apocalyptic number.

20788437915 is an abundant number, since it is smaller than the sum of its proper divisors (22324793445).

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

20788437915 is a wasteful number, since it uses less digits than its factorization.

20788437915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958 (or 8945 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 20788437915 in words is "twenty billion, seven hundred eighty-eight million, four hundred thirty-seven thousand, nine hundred fifteen".