20688344598 has 16 divisors (see below), whose sum is σ = 43554409920. Its totient is φ = 6533161416.

The previous prime is 20688344587. The next prime is 20688344603. The reversal of 20688344598 is 89544388602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90738240 + ... + 90738467.

It is an arithmetic number, because the mean of its divisors is an integer number (2722150620).

Almost surely, 2^20688344598 is an apocalyptic number.

20688344598 is an abundant number, since it is smaller than the sum of its proper divisors (22866065322).

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

20688344598 is a wasteful number, since it uses less digits than its factorization.

20688344598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181476731.

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 20688344598 in words is "twenty billion, six hundred eighty-eight million, three hundred forty-four thousand, five hundred ninety-eight".